AHC, Austria keeps much of the Sudetenland after WW1

Assuming that WW1 happens as in OTL, what would have led to the new rump Austria getting to keep at least a decent chunk of the Sudetenland, say most of it except for the Northern Moravia section. Geographically it would look like a top heavy letter C placed on top of Austria, and would obviously be really messy economically, logistically etc, but what factors would have made it possible?
Perhaps if under the Hapsburgs the Bohemian government had already been divided so that an intact Province of German West Bohemia already existed?
 
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