I actually kinda did that. Sent a preconfigured thinkcentre to my mum that boots into the jellyfin media player, connects to my server via tailscale. Just had to plug it into power, lan, hdmi. Immutable, atomic system that looks for updates on boot, applies them on next reboot, and does a rollback and ping me if the update fails.

I have ssh access, and my brother lives nearby in case everything fails, that makes things easier.