This is something more or less detached from a specific POD, it's about the question how Austria-Hungary could have been split up following a defeat in WWI analogous to OTL in the most reasonable way. Ethnic boundaries are complicated, but the borders that were applied in OTL with Saint Germain and Triannon were in many cases totally defying ethnic boundaries. The challenge, I ask therefore, is to create the most sane boundaries from the dissolution of Austria Hungary.