I really like this idea -- give ground pounders something to be happy about.
I would suggest, however that on one or two days (say Wednesday of a Sunday - Saturday week long event) enable troops on the German side. This would represent in abstract terms the Battle of the Bulge, and the only time the Germans could possibly make up for lost ground.
As for the question of whether a T-34 can take out a Tiger - on another thread this very question was asked, and someone answered that he was able to do it with a few shots at exactly 90 degrees. Given the slow rate of fire of the T-34, the Tiger must have been napping. But it is possible.
But given the fact that German supplies are disabled, even the M-8 can be effectively a Tiger killer. I was able to "kill" a Tiger with an M-8 once - I tracked him, then ran like a sissy. A couple minutes later an enterprising jabo finished him, but I got the kill (and something like 11 perkies!). Point is, without the chance of resupply, an M-8 tracking a Tiger is as good as a kill as long as the Tiger isn't sitting on top of the base's maproom.
One more point - aren't the perks in the AVA arena separate from the MA perks? I would think therefore that at least initially Tigers would be fairly rare with all the "new blood" having discovered AVA exists. And for those who have the perks -- would they want to risk them knowing an engine hit or tracking is as good as death?
So I say, great idea, leave the Tiger in (only chance for the Germans anyway), and lets go kill stuff.