I popped on the SNES with my Super Gameboy cartage for a visiting kid that’s like 7 and he was amazed playing Super Mario World 2. It was a whole new game for him. I wish I could get a cheap working gameboy for kids today, the used market is scam now with the prices people are doing.
Use a custom launcher. I use Flauncher and my home page only has jellyfin on it. No ads ever.