So, did you ever think "Oh boy, why does Austria always get Anschluss'd, it was about to go democratic?" ?

Here you go:

What you want to do first is to simply boost popularity for the party of your choice in Austria until your party of choice got about 1/3 of the support

Now at that point, contribute political power to a coup in Austria. If you're lucky, Anschluss finishes while Austria is in a civil war.

Now, this is the catch:

The Austria governed by Schuschnigg and the Vaterländische Front gets annexed, and "your" Austria doesn't.

This puts the civil war into a kind of limbo: It technically ends, but "your" Austria isn't touched by Germany or Schuschnigg-Austria.

And voilá, part of Austria still exists after Anschluss.