Something else you might want to consider, if art and PE are huge triggers for him, is asking for an opt-out for one or both classes. In our county, kids in several of the magnet programs have such full schedules they don't have time for PE. Instead they do it via independent study, or a sign off sheet whereby parents sign 5x a week that yes, Junior exercised for 20 minutes that day. (Outside activities, like youth soccer or little league, also count.) He could have library time during that period instead, which for most spectrum kids has a calming rather than agitating effect.
