Oh, and I bought some spicy Italian sausage at the Farmer's Market yesterday. I was going to use it all in the pink-eyed peas I'm cooking, but I think I'll put some back and try your idea.
Well, I froze a couple of the Mexican egg rolls to see how it would work. I brought two in today to have for lunch, and heated them in the toaster oven in the break room. It worked really well, although I might cut the frying time by about 30 seconds if I'm going to freeze and reheat later.