Call us when you revive thinkgeek and sell it to somone who will make something of it

DMG Gameboy Kirby Dreamland. My youngest loves it and it’s REALLY hard to lose so he doesn’t need a ton of help.

How techy are you and what level of handheld are you willing to get them? Retropie comes with a built in shutdown timer and you can set up cron jobs remotely to shut down after a time or even at certain times. Down side: You need to know how to set them up AND you are not going to get a machine that runs the latest and greatest.

You could go all out and get them a steam deck and set up crons but that’s strictly local to the machine.

Powkiddy V90. It’s got the GBA form factor, a good and same proportion screen. reasonable software and CFW support. Reasonably priced and a very easy to replace battery if it should be needed.