I'm curious is the trumpet is about the instrument itself or just the attention, tips and fun?
Reason I ask is that there are some more benign options. Juggling, mime, magic, dancing, standing very still like a statue (very eerie to see that kind of performer) ect. It takes some creativity and maybe some online tutorials if a special camp (with scholarship) is not an option. I looked into a scholarship for my difficult child to go to clown camp, he really is talented in that way.
Anyhow, there are lots of ways to have fun, use energy, be wild and silly and not poke the crabby ole dragons next door.
Plus, maybe some research and serious practive during the winter months to prepare for the spring "performance season" will keep your difficult child focused on a goal and looking forward to something positive.
Robin Williams started out as a mime. Everyone seems to hate mimes and I have no idea why, that type of expression takes serious skill...very quiet too 
Unless of course the grinches next door want to outlaw fun and happiness in general.
