The crock pot French toast would ertainly work. Not sure what would be a good side with it.
If it were me in this situation, I would make a 9x13 (or maybe 2- you probably know these peoples' appetites better than I) pan of egg casserole or egg strata. Still cheap, because it's just eggs and whatever random meat/veggies you want to throw in there. The only thing I usually serve on the side with that is toast, so you could also just bring a loaf of bread or maybe some fruit. The main dish is easy because you can make it ahead of time and just throw in the oven that morning.