Okay, local WWII history buff wades into the middle of the firefight
Sorry, Yomcat, but there ain't no way that Messerschmitt and Focke-Wulf would be able to break off from Germany, for a couple of reasons. For one, the Gestapo would've taken care of the people trying to break away before they'd even gotten around to the planning stage. And even if they somehow made it, they'd last all of about thirty seconds before the Jagdtigers rolled into their manufacturing facilities. The war in Bosnia proved something that military strategists have known for a while now: all-powerful air forces are great to have, and they can beat the crap out of the enemy. But you still need land forces to go and mop up the few guys who've managed to crawl into a cave somewhere (hence the strong American land presence in Afghanistan).
Now, a German vs. British/Russian/American aircraft plugin would be awesome. Try to rig it something like Deimos Rising, with you flying your bird against lots of air, sea and ground forces. Of course, all aircraft will have to be inertialless.
Okay, that's all for now.
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“You’re only given a little spark of madness. You mustn’t lose it.”
-- Robin Williams