We do that exact same allergy set and are now three weeks into packed lunches. Can you get a hold of better batter mix? It's the best tasting, best textured, most workable dough I've used. It's pricey, so I only use it for ds' s packed lunches. I've made pigs in a blanket, pizza (hold the cheese), buns, cinnamon rolls. I also do rice crackers/safe meat/daiya cheese, though he's complained of the mess the shredded cheese makes. Left overs in a thermos (stir fry with rice, veggies/ground meat/rice vermicelli mix), chili and chips. I do have rice tortillas to make sandwiches, but they don't hold up at all and crumble really easily. Oddly enough I can't get corn tortillas here. Soups would be good, but too dang hot right now. I also tried sausage rolls, but the dough was terrible tasting (a new gf flour blend by robin hood). Salads with roast chicken, sushi rolls. Sunbutter and jam/honey on safe bread.
I have more, but can't think of them. Oh, daiya came out with cream cheese spreads - too bad my ds doesn't like it. That would be an easy lunch...