Had a scan through there.
I think it makes sense to go for two shots each, maybe even on a 24exp camera. It means you would get quicker result and the chances of the camera coming to a sticky end are reduced.
I see x-rays have been considered.
Is there an XP2 disposable camera, that could be fun. There is the HP5 camera but I think XP2 with it's big lattitude would be better.
If there is, once all the shots are taken, you could have the film cut into strips of four. Every other person would be sent 4 negs to print preferably in the darkroom.

Just my thoughts, if a little late, and fingers crossed that camera pops up again.