What about a food warmer?
When I was working as a home instructor I bought one (this one, actually
) and it came in handy in the winter. I put my food in, plugged it in at the houses I worked at and come lunch time the food was warmed up. If there's a place you could plug one of these in for a few hours you could have a nice, warm lunch.
My favorite go-to "warm" lunch was spaghetti squash with chicken, roasted peppers, broccoli, and whatever other veggies I had lying around