We also have some Crickets for the smaller kids. The Americans are full size and your son will be able to use it his whole life and if he isn't real small, he should be fine. Ours are the regular size, not the compact.
Just FYI, we have Ruger American 22's for our youth program at the local club. They make and we got single round magazines for them. Essentially making them single shot 22's. Safer for training IMO. The mags are the same as 10-22's.
Getting an elk out has always been my biggest concern also. At 67 yrs old I have to know my limitations and try to hunt accordingly. I have managed to get my elk out by myself the last two years (thank you EXO) but who knows the future. I know a guy local who has horses and has said he would...
My understanding is onyx is a map service, not a GPS. If you have issue with tracking or compass, it's your device not the map. I did have problems with the compass in the Garmin but it was caused by the magnetic closer in my bino harness. Ditched that and no more compass issues.
It is legal to carry a weapon on an ATV, even a rifle with an empty chamber. Car, truck, whatever. Road closures are a Federal regulation, not a State one. There are special motorized vehicle regs in some areas. And maybe that could be a problem.
Read the proposal. As for ATV's, they aren't really the wardens issue, that would be USFS. And lighted nocks, expandable BH and lighted bowsights are just not allowed and nothing to do with res/ NR issue.