J.H.
Hmmm...well, I like the tent idea but I'm not sure about the food issue. Our daughter doesn't really eat a lot of surgery foods especially before bed. We could do all the calming routines in the book but once she sees the bed and has her books she gets on top and runs/jumps all the way to the pillows. We've tried the walking out method too but even though it helps in that moment it doesn't seem to solve the problem long term.
Our daughter loves books so she knows if she's misbehaving we tell her we won't read books until she has calmed down. This seems to help and maybe getting some new books would help or distract him too. (maybe sound ones) It's hard once they get used to do something (bad or good) to break that habit.
Good luck!