What insulin pump is your son on? I know the one I am on has a remote control that is available but I am not sure what functions can be done from it. I didn't want to spend the extra money on something that isn't covered by my insurance. It isn't a watch either so I'm not really sure. You could try going to the website of the pump your son is using and looking for pump accessories to see what is available. I believe there is a continuous glucose monitor that is like a watch. I haven't tried anything like that though either. You could also call the pump company and speak to one of the reps.
What doesn't kill you makes you stronger. Shouldn't I be invincible by now?