For what it's worth, in my German DNA/Heritage Facebook group, a guy shared a pie chart with Swiss-German Y DNA samples, and while only 6% is R1a, it is all M458.
The Lech samples (Mittnick paper, iirc) were found some 200 kms to the east, in southern Germany, just north of the Austrian border. At approximately the same latitude.
To me, this guy looks like a typical Urnfield sample, in spite of his haplogroup.
Don't think it was mentioned. The recent British Paper also found an Iron Age La Tene sample dated to 250BCE in Bohemia, Czechia that was R1a-L1029. It was predicted R-YP5267 however this is a no call based on yfull, including a number of other downstream branches. Yfull has currently left it as R-L1029. This is pretty big considering the claims that R-L1029 only came with Slavs. Now we have a R-M458 in late Hallstatt from the previous Switzerland Neolithic study and this R-L1029 from La Tene in Czechia. Assuming it is truly downstream, then R-L1029 is at least 2250ybp if not greater.
The only interesting thing is the sample is very Scando-Germanic and not too western. Then again some other La Tene samples had a very Balto-Slavic drift according to Tomenable on Anthrogenica. Below is the R-L1029 La Tene autosomal.
https://yfull.com/tree/R-L1029/
Czech_IA_LaTene:I13780___Date:-300BCE___R-L1029,0.119514,0.128972,0.072407,0.060078,0.035083,0.023427,0.002115,0.014769,0.004704,-0.009659,-0.008444,0.003147,-0.008771,0.000963,0.009908,0.009149,0.014081,0.003294,-0.000503,0.008254,0.003494,0.00643,0.001972,0.006386,-0.001796
[TABLE="class: distances"]
[TR]
[TH="align: right"]Distance to:[/TH]
[TH="align: left"]Czech_IA_LaTene:I13780___Date:-300___Coverage_66.91%[/TH]
[/TR]
[TR]
[TD="bgcolor: #86FF00, align: right"]0.02628619[/TD]
[TD]VK2020_RUS_Ladoga_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #88FF00, align: right"]0.02669941[/TD]
[TD]VK2020_DNK_Funen_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #8BFF00, align: right"]0.02721430[/TD]
[TD]SWE_Viking_Age_Sigtuna[/TD]
[/TR]
[TR]
[TD="bgcolor: #91FF00, align: right"]0.02844003[/TD]
[TD]HUN_MBA_Fuzesabony[/TD]
[/TR]
[TR]
[TD="bgcolor: #93FF00, align: right"]0.02879865[/TD]
[TD]VK2020_SWE_Oland_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #94FF00, align: right"]0.02910117[/TD]
[TD]VK2020_England_Oxford_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #95FF00, align: right"]0.02919599[/TD]
[TD]CZE_Unetice_C[/TD]
[/TR]
[TR]
[TD="bgcolor: #95FF00, align: right"]0.02928253[/TD]
[TD]VK2020_SWE_Skara_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #98FF00, align: right"]0.02988473[/TD]
[TD]VK2020_NOR_South_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #9AFF00, align: right"]0.03017744[/TD]
[TD]VK2020_IRL_Dublin_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #9AFF00, align: right"]0.03027493[/TD]
[TD]VK2020_Isle_Of_Man_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #9BFF00, align: right"]0.03040232[/TD]
[TD]VK2020_DNK_Sealand_EVA[/TD]
[/TR]
[TR]
[TD="bgcolor: #9BFF00, align: right"]0.03043400[/TD]
[TD]VK2020_NOR_North_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #9DFF00, align: right"]0.03076554[/TD]
[TD]VK2020_EST_Saaremaa_EVA[/TD]
[/TR]
[TR]
[TD="bgcolor: #A4FF00, align: right"]0.03210895[/TD]
[TD]Scythian_MDA_o[/TD]
[/TR]
[TR]
[TD="bgcolor: #A4FF00, align: right"]0.03213348[/TD]
[TD]SWE_Ollsjo_BA[/TD]
[/TR]
[TR]
[TD="bgcolor: #A4FF00, align: right"]0.03224815[/TD]
[TD]VK2020_SWE_Uppsala_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #A5FF00, align: right"]0.03231249[/TD]
[TD]ISL_Viking_Age_Pre_Christian[/TD]
[/TR]
[TR]
[TD="bgcolor: #A8FF00, align: right"]0.03294364[/TD]
[TD]VK2020_DNK_Sealand_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #A8FF00, align: right"]0.03303636[/TD]
[TD]CZE_Bilina_BA[/TD]
[/TR]
[TR]
[TD="bgcolor: #A9FF00, align: right"]0.03305397[/TD]
[TD]VK2020_NOR_Mid_IA[/TD]
[/TR]
[TR]
[TD="bgcolor: #A9FF00, align: right"]0.03311948[/TD]
[TD]SWE_LN[/TD]
[/TR]
[TR]
[TD="bgcolor: #A9FF00, align: right"]0.03317952[/TD]
[TD]CZE_Unetice_EBA[/TD]
[/TR]
[TR]
[TD="bgcolor: #AAFF00, align: right"]0.03335834[/TD]
[TD]DEU_Halberstadt_LBA[/TD]
[/TR]
[TR]
[TD="bgcolor: #ABFF00, align: right"]0.03348884[/TD]
[TD]VK2020_IRL_Eyrephort_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #AFFF00, align: right"]0.03438701[/TD]
[TD]DEU_Unetice_EBA[/TD]
[/TR]
[TR]
[TD="bgcolor: #B0FF00, align: right"]0.03458709[/TD]
[TD]VK2020_SWE_Gotland_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #B1FF00, align: right"]0.03476183[/TD]
[TD]VK2020_NOR_South_IA[/TD]
[/TR]
[TR]
[TD="bgcolor: #B2FF00, align: right"]0.03493705[/TD]
[TD]VK2020_NOR_Mid_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #B2FF00, align: right"]0.03496362[/TD]
[TD]VK2020_DNK_Langeland_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #B3FF00, align: right"]0.03506426[/TD]
[TD]VK2020_England_Dorset_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #B4FF00, align: right"]0.03524778[/TD]
[TD]England_CA_EBA[/TD]
[/TR]
[TR]
[TD="bgcolor: #B4FF00, align: right"]0.03525566[/TD]
[TD]VK2020_DNK_Jutland_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #B6FF00, align: right"]0.03559762[/TD]
[TD]VK2020_RUS_Gnezdovo_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #B6FF00, align: right"]0.03564174[/TD]
[TD]England_MBA[/TD]
[/TR]
[TR]
[TD="bgcolor: #B6FF00, align: right"]0.03566515[/TD]
[TD]HUN_Fuzesabony_MBA[/TD]
[/TR]
[TR]
[TD="bgcolor: #B7FF00, align: right"]0.03596693[/TD]
[TD]DEU_MA_Alemannic[/TD]
[/TR]
[TR]
[TD="bgcolor: #B8FF00, align: right"]0.03599006[/TD]
[TD]IRL_BA[/TD]
[/TR]
[TR]
[TD="bgcolor: #B8FF00, align: right"]0.03612936[/TD]
[TD]Corded_Ware_CHE[/TD]
[/TR]
[TR]
[TD="bgcolor: #B9FF00, align: right"]0.03622534[/TD]
[TD]Bell_Beaker_FRA[/TD]
[/TR]
[TR]
[TD="bgcolor: #B9FF00, align: right"]0.03635777[/TD]
[TD]VK2020_ISL_Hofstadir_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #BAFF00, align: right"]0.03645440[/TD]
[TD]England_Saxon[/TD]
[/TR]
[TR]
[TD="bgcolor: #BCFF00, align: right"]0.03693579[/TD]
[TD]Scotland_CA_EBA[/TD]
[/TR]
[TR]
[TD="bgcolor: #BFFF00, align: right"]0.03745462[/TD]
[TD]VK2020_SWE_Oland_IA[/TD]
[/TR]
[TR]
[TD="bgcolor: #BFFF00, align: right"]0.03748197[/TD]
[TD]VK2020_SWE_Malmo_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #C0FF00, align: right"]0.03760580[/TD]
[TD]ISL_Viking_Age_Early_Christian[/TD]
[/TR]
[TR]
[TD="bgcolor: #C1FF00, align: right"]0.03791398[/TD]
[TD]VK2020_ISL_Hringsdalur_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #C2FF00, align: right"]0.03803242[/TD]
[TD]VK2020_GreenlandE_VA[/TD]
[/TR]
[TR]
[TD="bgcolor: #C2FF00, align: right"]0.03804941[/TD]
[TD]Scotland_MBA[/TD]
[/TR]
[TR]
[TD="bgcolor: #C5FF00, align: right"]0.03855028[/TD]
[TD]CZE_Unetice_preC[/TD]
[/TR]
[/TABLE]
[TABLE="class: distances"]
[TR]
[TH="align: right"]Distance to:[/TH]
[TH="align: left"]Czech_IA_LaTene:I13780___Date:-300___Coverage_66.91%[/TH]
[/TR]
[TR]
[TD="bgcolor: #9EFF00, align: right"]0.03107253[/TD]
[TD]Swedish[/TD]
[/TR]
[TR]
[TD="bgcolor: #AEFF00, align: right"]0.03407228[/TD]
[TD]Danish[/TD]
[/TR]
[TR]
[TD="bgcolor: #BCFF00, align: right"]0.03690219[/TD]
[TD]Norwegian[/TD]
[/TR]
[TR]
[TD="bgcolor: #C2FF00, align: right"]0.03803563[/TD]
[TD]Dutch[/TD]
[/TR]
[TR]
[TD="bgcolor: #C4FF00, align: right"]0.03850085[/TD]
[TD]Czech[/TD]
[/TR]
[TR]
[TD="bgcolor: #C6FF00, align: right"]0.03880685[/TD]
[TD]Icelandic[/TD]
[/TR]
[TR]
[TD="bgcolor: #CAFF00, align: right"]0.03968601[/TD]
[TD]Slovakian[/TD]
[/TR]
[TR]
[TD="bgcolor: #CEFF00, align: right"]0.04030604[/TD]
[TD]German[/TD]
[/TR]
[TR]
[TD="bgcolor: #D2FF00, align: right"]0.04122974[/TD]
[TD]German_East[/TD]
[/TR]
[TR]
[TD="bgcolor: #D9FF00, align: right"]0.04263225[/TD]
[TD]Afrikaner[/TD]
[/TR]
[TR]
[TD="bgcolor: #DBFF00, align: right"]0.04295286[/TD]
[TD]Orcadian[/TD]
[/TR]
[TR]
[TD="bgcolor: #DFFF00, align: right"]0.04372199[/TD]
[TD]Scottish[/TD]
[/TR]
[TR]
[TD="bgcolor: #E1FF00, align: right"]0.04420439[/TD]
[TD]Welsh[/TD]
[/TR]
[TR]
[TD="bgcolor: #E2FF00, align: right"]0.04425067[/TD]
[TD]Shetlandic[/TD]
[/TR]
[TR]
[TD="bgcolor: #E6FF00, align: right"]0.04503607[/TD]
[TD]English[/TD]
[/TR]
[TR]
[TD="bgcolor: #E8FF00, align: right"]0.04557798[/TD]
[TD]Irish[/TD]
[/TR]
[TR]
[TD="bgcolor: #EBFF00, align: right"]0.04603910[/TD]
[TD]Polish[/TD]
[/TR]
[TR]
[TD="bgcolor: #EDFF00, align: right"]0.04641354[/TD]
[TD]Hungarian[/TD]
[/TR]
[TR]
[TD="bgcolor: #EDFF00, align: right"]0.04647956[/TD]
[TD]Austrian[/TD]
[/TR]
[TR]
[TD="bgcolor: #F2FF00, align: right"]0.04746456[/TD]
[TD]English_Cornwall[/TD]
[/TR]
[TR]
[TD="bgcolor: #F7FF00, align: right"]0.04837559[/TD]
[TD]French_Brittany[/TD]
[/TR]
[TR]
[TD="bgcolor: #FDFF00, align: right"]0.04968429[/TD]
[TD]Ukrainian_Zakarpattia[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFFF00, align: right"]0.04991814[/TD]
[TD]Moldovan_o[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFF700, align: right"]0.05164159[/TD]
[TD]Ukrainian_Rivne[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFF300, align: right"]0.05229883[/TD]
[TD]Sorb_Niederlausitz[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFF300, align: right"]0.05232111[/TD]
[TD]Slovenian[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFF000, align: right"]0.05296155[/TD]
[TD]Ukrainian_Lviv[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFEF00, align: right"]0.05305395[/TD]
[TD]Croatian[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFEE00, align: right"]0.05330603[/TD]
[TD]Ukrainian_Zhytomyr[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFED00, align: right"]0.05351284[/TD]
[TD]Ukrainian_Dnipro[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFE800, align: right"]0.05458089[/TD]
[TD]Cossack_Ukrainian[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFE600, align: right"]0.05480880[/TD]
[TD]French_Pas-de-Calais[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFE600, align: right"]0.05487720[/TD]
[TD]Belgian[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFE600, align: right"]0.05493008[/TD]
[TD]Cossack_Kuban[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFE200, align: right"]0.05577678[/TD]
[TD]Russian_Ryazan[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFE100, align: right"]0.05588682[/TD]
[TD]Russian_Kursk[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFE100, align: right"]0.05592245[/TD]
[TD]Russian_Voronez[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFDE00, align: right"]0.05639263[/TD]
[TD]Ukrainian_Chernihiv[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFDE00, align: right"]0.05648447[/TD]
[TD]Finnish_Southeast[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFDC00, align: right"]0.05690758[/TD]
[TD]Russian_Orel[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFDA00, align: right"]0.05727454[/TD]
[TD]French_Nord[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFD900, align: right"]0.05738049[/TD]
[TD]Ukrainian_Sumy[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFD900, align: right"]0.05754003[/TD]
[TD]Russian_Belgorod[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFD600, align: right"]0.05796932[/TD]
[TD]Russian_Tver[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFD600, align: right"]0.05802483[/TD]
[TD]French_Seine-Maritime[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFD300, align: right"]0.05854575[/TD]
[TD]French_Alsace[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFD200, align: right"]0.05879021[/TD]
[TD]Russian_Kaluga[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFD200, align: right"]0.05891401[/TD]
[TD]Russian_Smolensk[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFCC00, align: right"]0.06009014[/TD]
[TD]Polish_Kashubian[/TD]
[/TR]
[TR]
[TD="bgcolor: #FFCA00, align: right"]0.06032952[/TD]
[TD]Lithuanian_PA
[/TD]
[/TR]
[/TABLE]