I think as long as it is tongue-in-cheek, and the swastika pasties are part of the punchline to the whole performance, you should be fine. As long as there is enough piss taking of the Nazi sensibilities then the routine shouldn't be too controversial.

thanks for your input hun...thats exactly what i had thought too but being very very new to it all i didnt want to be crossing uncrossable boundaries but it seems like as long as its done appropriately there is very little that isnt fair game in the burly word...huzzah!!!!