A lot of the ideas referenced here remind me of the excellent timeline
Es Geloybte Aretz by @carltonbach, which has a PoD where Wilhelm II dies soon after becoming Kaiser and is succeeded by his son Wilhelm III with a regency led by his uncle Prince Albert. This results in Germany being less bellicose on the world stage and avoiding many of the antagonistic actions that led to WWI. Instead, they fight two wars with the Russian Empire and carve out a Kingdom of Poland that becomes a haven for Eastern European Jews. While antisemitism continues to be an endemic problem in German society and right-wing “völkische” parties are boosted by figures like Alfred Hugenberg, there is no direct analogue to the Nazis because even the most virulently intolerant parties stay within the established status quo rather than attempting to kill off everyone they don’t like. Russia, in contrast, becomes “integralist” (ie. similar to fascist but with heavier reliance on existing institutions like the tsardom and the Orthodox Church) under the Patriotic Union and conducts several pogroms against Jews and other minorities within their borders. However, this brutality is far more disorganized than the industrial slaughter perpetrated by the Nazis. Overall, not trying to stop you from writing your own timeline by any means, but I definitely think Es Geloybte Aretz is worth a read!