Right. As for the manner of division itself, I think OTL makes an acceptable starting base, but some things would be better off changed.
Ukrainians in the north-east get their own state;
Yugoslavia should either be a federal Kingdom from the start (internal borders should mostly be decided by plebiscite) or 3-4 different states (again, through plebiscites);
An autonomous province for the Szekelys within Romania;
Allow Austria to join Germany;
Not sure what would be the best solution for the Germans in Czechia.
Ukrainians in the north-east get their own state;
Yugoslavia should either be a federal Kingdom from the start (internal borders should mostly be decided by plebiscite) or 3-4 different states (again, through plebiscites);
An autonomous province for the Szekelys within Romania;
Allow Austria to join Germany;
Not sure what would be the best solution for the Germans in Czechia.