Northerner, I wrote "could": it's more a feeling based upon generalisations than a fine scale study of mine!
But as I saw you put so much faith in me, I looked at a map with distribution of some axes styles in BA: it shows at least that close North to, or in northern part of Worra-Fulda group territory near the Weser, only a BA axe seems "occidental" (Celtic?) when 3 other axe pertain to a more eastern style group, style centered between E-Weser and Saale/Elbe region, called 'Westeregeln' style. Not sure, but could (always!) confirm a "frontier" group for Worra-Fulda group at those times (before Urnfields/IA) with more eastern affinities.
Glauberg (later, as you mentioned) is more southwestern than the Worra-Fulda territory and is attracted by the Rhine. Hessen concerning water-floods is not homogenous, and at those times, this had more weight than currently.
I double checked it but the R1b U106 Z156>Z304 (>DF96/98) that has a connection with NW Bohemian Tumulus culture is imo a 'strong case'.
Again the samples I selected the NW Czech and the Dutch one and especially Z156>Z304> DF96/98:
PNL1 U106 shotgun & 1240K 2914-2879 calBCE 25-30 Early Corded Ware Plotiště nad Labem, Hradec Králové, Bohemia, Czech Repuplic
I7196 DF98>S1911(1 read)>S1894(1 read) NextSeq 500 2200-1950 BCE 40+ Older Únětice Jinonice, Prague, Czechia
I4070 U106>>Z381(3 reads)/ (?Z304- 1 read) NextSeq 500 1880-1657 BCE 26-49 Early Bronze Age, ?Elp De Tuithoorn, Oostwoud, Noord-Holland
I11972 U106>>Z381 (-Z301) 1240K 1501-1310 calBCE 50-65 Middle Bronze Age Westwoud, Binnenwijzend, Noord-Holland
I17019 U106>>Z381>Z156>>Z306>>Z304 1240K 1421-1216 calBCE Middle Bronze Age Vlaardingen-Krabbeplas, Zuid Holland
I13788 U106>>Z381>Z156>>Z306>Z304 1240K 1300-800 BCE >50 Late Bronze Age Chouč, Hrobčice, Teplice, NW Bohemia
I23978 U106>>Z381>Z156>S5520>FT221936 1240K 742-400 calBCE infant Early Iron Age Zagorje ob Savi, Upper Camiola, Slovenia
I11149 U106>>Z381>Z156>Z307 [Z8160] 1240K 733-397 calBCE Early Iron Age Teversham, Cambridgeshire, England
I15950 U106>>Z156>>Z304>BY12480>BY12482/Y28944 1240K 480-390 BCE 35-60 La Tène Teplice, Ústí nad Labem , NW Bohemia
I12907 U106>>Z381>>Z306>>Z304 1240K 356-57 BC c8 Iron Age Uitgeest-Dorregeest, Noord-Holland
I checked the literature, I saw this work of Ivan Hásek, in which is underlined that NW Bohemian Tumulus is indeed the "rich Tumuli" one, and is somewhat differentiated from the more Southern one.
https://www.jstor.org/stable/26293013
And the ancient Bronze Age road from the Northern Netherlands to NW Bohemia is also there:
https://www.google.com/maps/d/u/0/v...60673901&z=7&mid=155QfTUAn19J3sYO_kFvqkt02EP0
With the Tumulus Fulda-Werra (Hessen, middle Germany) group and area as a kind of intermediary, literally and figuratively halfway!