Whistle
Photon flashlight
(Both as neck carry)
Maybe very small FAK: 3 bandaids w/ alcohol wipes?
neat idea. Hope it does not run afoul of the school security rules.
Build a breakaway link into the necklace-5 year olds do a lot of wrestling around, and it would be bad to get him strangled.
Ditch the alcohol wipes-flammable, hurts when you rub it on broken skin, damages healthy cells at wound margins, replace with packet of antibiotic ointment, or use antibiotic impregnated bandaids.