The thought has interested me enough that I've been working up an alt history timeline lol. I haven't worked out the details yet past changing the date of the uprising, but my rough plan so far is that once the counter-revolution is defeated in Germany and the USSR, Rosa returns to Poland to start agitating there, since she isn't killed in this timeline. With pressure from both the east and west from the two communist countries, eventually a communist government comes to power in Poland, opening up a land corridor from Germany to the USSR. That's as far as I've had the time to think about it though lol