kids love apps. they'll get it faster than handing them a flash drive

You're welcome! The more good options you have, the better. 😉

Stamp an xpub onto metal for the baby. It makes the gift more personal (and durable for the future).

Yeah, it's not a bad choice tbh... I mean it's not a trustless setup of course given that I could have made a copy 😅 but I can at least trust myself to burn after use and I sure don't have a photographic memory 😂