I think several people have done this and it isn't too hard - I did it a couple of times with the four whales game.
Is anyone familiar with Barbarian Wrath? I think it is a hex edit mod that makes tons of Barb units - that might make a fun challenge. Your WW2 challenge makes me want to play OCC again after moving all of those units everyturn!
Or maybe another readily available war scenario that folks could play at the same time?? Something less involved than RedFront of course. Maybe a limited number of turns on a big scenario - like ten or twenty.