It would not be inappropriate for Tom to carry an epinephrine self injector. Maybe two sizes, for differing body mass since he has such an age range.

I would not do it w/o a Rx and a letter from the doc attesting to the instruction he has been given concerning its use.

Virtually every state has a "good samaritan" statute shielding one from criminal and civil liability. And, while release forms are not worth the paper they are written upon, it would not hurt to get a parent to sign something whereby they acknowledge having been informed that emergency treatment may be necessary, and that neither the BSA nor the coucellor is responsible for bad outcome so long as the treatment is undertaken in good faith. Releases/waivers are easy to pierce, but what they are good for is forcing someone to acknowledge that they were advised of a particular risk.