I don't think this could really work out... Really, the premise could be better executed with a application of Wolfenstein where it happened. Really, and ultimately, turning the RP into a glorified Wolfenstein NRP.

The major factor you have to consider is not only what was pointed out before (although the Austrian-Hungarian Empire wasn't all that strong, it was kind of systematically on the retreat most of the time, it was like Russia without the meaty mass of bodies to drown people in). But you also have to take into account: Adolf at this time was a young college-age kid with no interest in politics. Really, he was an aspiring painter with no interest in politics. It would take a Great War to draft him when his Art School dreams took a shit and the resulting experiences and traumas in that to pull him to the side of Fascism, since fascism ultimately feeds on nations who feel they were wronged or greatly weakened in their recent and memorable history.

So under the proposed premise: it wouldn't work. It would have more chances working if you assume the sort of moves Germany underwent for the Wolfenstein universe: Ancient Jewish super-tech, ancient super-natural rituals, and some crazy-smart antagonists.

[youtube]https://youtu.be/2GKpwDMuemM[/youtube]