You seem well read on this subject and coming to reasonable conclusions, so hopefully this doesn’t seem like nit-picking, because it’s meant only to add to your mental picture of the physical anthropology of Europe. The Finns, genetically, are about 25% Siberian, not including the Swedes long settled there. I’m afraid I don’t have a link for you, but will search my browsing if you like, and may turn it up before you’re able to through search engines. I just came across that factoid recently, randomly.
Hungarians are distantly related to Finns linguistically, and also migrated from what is now Russia, but Hungarians look pretty much like their present-day Slavic or Germanic neighbors in Europe.