This should've unironically become a thing after WW1

Add Hungary
They are Slavs in denial and if not Slavic they will definitely fall into out German continental sphere
Actually forget it, we need them to create the Greater Prussian Reich from Netherlands to Siebenbürgen

They were always under German sphere and so they would probably stay there. But I guess in such scenario Hungary would like to play a second switzerland being neutral and balance between powers