Great idea! I also had a similar idea. I made ESP32 and RPi based audio players as well to play these things. To get small kids off the phones. I also looked at the Moo Cards, but felt the size to be rather small for nice art work. Some links:

https://linki.cc/ https://github.com/timotoots/linki_players

At the moment, it's an art project. It could be more, but too many things to do currently.