What needs to happen for the Ashkenazi Jews to be seen as a sort of "sub-race" of Germanic peoples (like Scandinavians/Nordic, Rhenish, Anglo-Saxons, etc) by the so-called "scientific racism" of XIX century Europe?
They have, after all, similar ethnic and linguistic backgrounds (Ashkenazi Jews have Near East linneages, yes, but also strong Central European ancestry, and speak Yiddish, which is a Germanic language despite being written in Hebrew script).