That's a good start, but I need more internationalist sentiment in the Austrian socialists *before* WW1...
Well, and this is just guesswork, mind you, you could have the co-operation start in the Hungarian half of the monarchy as a grassroots banding together of various groups in opposition to the Hungarian aristocracy and their stooges. Nothing helps unity along like a fight against a common enemy (keeping it going afterward, however, is another story entirely).
There was the Hungarian Social Democratic party which supported Bela Kun's revolutionary state (though they were rather moderate compared to the decidedly radical Bela). Alterantively, you could have Bela Kun exposed to a more intellectual brand of communism/socialism instead of the highly radical variant he adopted as a PoW in Russia, he seems to have had the charisma. The other big part of the Hungarian half, Croatia, well ... they didn't really have communists
per se at the time, though Radic (founder and leader of the Peasant's party, but only after the war, though he was a rather radical politician before and during it, actually publicly burning the flag of Austria-Hungary as a student on the day Fraz Josef I. visited Zagreb) would later on spend quite a bit of time in Moscow during Lenin's days, claiming to find much to be inspired from in the Soviet Union. I'd say he was more of a socialist than a communist, but it takes all kinds, right?
The initial revolution probably
would be rather diverse in ideology. The Hungarian Soviet Republic was, at least initially.
The real problem with Austria-Hungary is that the majority of their major communists only really emerged from the Great War (the front was great for disseminating communist ideals) ... and by then you're pretty much too late to have a Red Danubia emerge.
It's entirely possible that there were other significant persons that could be used ... and someone else can probably help more than I can, but I've gone with what I knew OTOH.