I think this is a clever idea and we may give it a try. I am surprised, though, that there is no vegetarian option. We have a vegetarian in our family, which will make this tricky. I guess we could disassemble the sandwiches, but it seems odd that there wouldn't be a veggie wrap or something in the first place as an option.
I also wonder about the mashed potatoes and gravy, if they are together in one container. (Our veggie loves mashed potatoes.) Since the info makes such a point of no substitutions or modifications, I wonder if we can get "no gravy," or if that would be a big deal.
Still, it's a clever idea that sounds fun to try.