So essentially what are the effects on history should the stabbed in the back theory place the blame for losing ww1 on the Austrians for not being able to pull their weight instead of Jews etc etc
I know this was just my clumsy attempt at trying to explain that this prevailing attitude would be replacing the stabbed in the back theory.The 'Stab in the back' myth was in its beginning against any kind of (mainly) civilian wanting peace in opposition to the 'brave' soldiers.
It quickly was aimed mainly at the socialists and whoever participated in the revolution of 1918. The jews as part of it were 'blended' in only later, like an afterthought.
However, your idea is ... interesting, esp. as there were a lot of - to put it mildly - animosities between the german general staff and senior officers and the austrian general staff and senior officers.
Were there maybe also some austrian, ex-austrian socialists participating in the revolution in germany ? ... could there some 'connections' been constructed ? You would need some german socialists to 'confess' being influenced/teased/bribed/etc. by austrians into revolution to give it some more 'weight'.