I remember you mentioning guides earlier now you mention it Scout. D'oh! Even your name! Sorry.
A lot of restaurants use heavy paper napkins so hopefully they would work. I would try it out first though.
What sort of space do you have? I used to teach and when the students were wound up and stressed I always recommended moving around and being silly.
Would they enjoy a party? (like a little kids tea party?) eg musical statues, crazy dancing etc. I know it sounds a bit twee but kids that age rejoice in re embracing their inner child (as you said) and need to be silly and let off steam.
BlackCat I have been thinking that all day. The thread is taking forever to load and moving a bit faster. I will start a new one and link to it here.