1. Rump Slovakia (without Upper Hungary, Kosice and Bratislava)
Theoretically possible. I could certainly see a
Czechoslovakia with less Slovakia, and that CZS might somehow fragment, for instance. Nothing impossible about the borders themselves, although the idea of a Slovak state wasn't going far in 1919.
2. Subcarpathian Ruthenia
This I don't see: it would have to be
utterly dependent on somebody (Poland or Romania, maybe) and I don't see why they'd go to the trouble when they could give it to a chum (Hungary or CZS).
3. Rump Ukraine (without Lviv and Kiev)
Pretty well impossible. Without Lviv means Ukrainian Galicia has gone Polish, since if the Poles can take it and push on, the UGA run out of bullets eventually. Without Kiev reduces the Dniepr Directorate to an army on the run and litte more.
4. Rump Belarus (Soviet Socialist Republic of Belarus first borders)
Not happening. Belarus is Soviet or Polish. Nothing there that can sustain a state: no widespread national consciousness, no resources, no tradition, no army. I could see all of the first BSSR going Polish, and possibly being made part of some sort of Intermarum, but that's obviously going to be
very Polish-dominated.
The idea of a leftist Germany and a Junker Taiwan in East Prussia - semi-dependent on Poland but never going to admit it in a hundred years - is a favourite little hang-up of mine, so I'll have to say it's viable.
