Katyn was pretty well known during WW2 among the Poles in exile, AFAIK. That was a big sticking point between the British and Polish governments, as the Poles didn't want to let Stalin off the hook, and the British (and later Americans) rather wished it would go away and not offend the Soviets. Since the information came from the Red Cross through the Germans, some wanted to believe it was a Nazi provocation.
If we're talking invasions, don't forget the 1919-20 Polish-Soviet War.
IMO, the bulk of the Polish population might wish to be rid of the Soviets, but NATO couldn't do much to win them over to active support. And yes, the German participation/leadership of the eastward drive should have depressed that support.
I hypothesize that at least some Polish individuals would have taken the opportunity to join the American/British elements of NATO in '97, but very few after that. A Polish Free Legion could have formed, but I don't think it would be even as big as a division. An argument may be that some would think if they help the Americans and British, then they could have some leverage against the Germans. Thus, my suggestion of an attempted coup among Polish army units in 2000 to suddenly become an independent actor.
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My Twilight claim to fame: I ran "Allegheny Uprising" at Allegheny College, spring of 1988.
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