That's some very interesting proposal, thanks! I'd love to add such great flavor events.
But don't you think this should rather be integrated into DH-Full directly, rather than the interwar mod?
I mean, just out of curiosity, have you proposed this in the general suggestions forums already? If yes, what was the feedback?
All that will be solved, as soon as WW1 is over. As of the treaties like the versailles treaty, they had to return/liberate the land in the east, after Germany was defeated. Austria Hungary will at some point receive an event called the Lansing Note, which makes them disintegrate into austria, czechoslovakia, hungary and so on.
On a sidenote: ahistorical outcomes will be implemented in the future.