Map challenge: Austria with these borders

With a POD anytime after 1900, have Austria acquire the borders that Australia has on this map:

z80amd9ii4021.jpg
 
It's impossible to get a perfectly Australia-shaped Austria, but here's my shot: Austria gets a better deal out of WW1, while Germany is hit harder and ends up on the verge of collapse. At the 1919 Peace Treaty (Trianon, Versailles etc), the Austrian Army is still largely intact and the Imperial Government has held out in Vienna. They get to keep the Southern Sudetenland and are co-opted into helping the new German Government in putting down communist uprisings in Bavaria. Austria ends up occupying Bavaria while the rest of Germany fragments into successor states, and the 2 are locked in customs Union for a while before Austrians and Bavarians vote to merge into one nation by the 1950s.
 
Is that a swiss Vorarlberg?

If you give Vorarlberg to the swiss (something the folks there voted to do after WW1), give Austria the southern Sudetenland, give Upper Bavaria, Lover Bavaria, and the Upper Palatinate to Austria (following WW2?) and divide Slovenia between Italy and Austria (like OTL during WW2) and that more or less gets you something similar.



upload_2018-11-23_21-25-13.png
 
Top