Heh. A rational (i.e. non-Nazi) German right-wing government might muster some international goodwill for an anti-Soviet crusade. Unfortunately, such a right-wing government cannot drop the claims on Polish territory and on Danzig - if it does, there will be some farther-right party, say the NSDAP, which steals its base and voters. And if that rational non-Nazi government doesn't drop claims on Polish territory and Danzig, it cannot have an alliance with Poland.
Of course the alternative is a workers' frontist government of the SPD with the KPD; that one might drop aggressive anti-Polish rhethoric, but it would naturally not embark on an anti-Soviet crusade.
On top of that, in OTL Hungary and Romania fought on the same side only because the meanest bully on the block forced them to. The one less willing to comply was going to lose more of Transylvania to the other. And as soon as the bully's power waned, one of the two changed sides and had at it for Transylvania.
If you have a rational, non-Nazi German government, it's unlikely it can force these two to be friends.
It's the problem with nationalism. You can have an internationalist internationalism, but you can't have an internationalist nationalism.