Off topic but related to Android replacement on phones, let see if anyone can help me: I have an old Xiaomi Mi 9SE in a drawer, and I would like it to give it t

Off topic but related to Android replacement on phones, let see if anyone can help me: I have an old Xiaomi Mi 9SE in a drawer, and I would like it to give it to my daughter as a Spotify player and that's it. No phone, no camera, no browser. Just Spotify. What would be the best way to start? PostmarketOS doesn't support it, GrapheneOS is security-focused, LineageOS is basically a full-fledged Android, I don't know if I would be able to limit it as I would.