It may be possible to create a UI using a monitoring program like Zabbix.
You could create a custom dashboard that displays all the stats that they need to see.
This of course would be for viewing only, not controlling the schedules, retention etc
Markor on Android and Obsidian on Desktop.
All synced with syncthing
Look at Mikrotik. Very affordable and extremely powerful. Only do this though if you know what you are doing with networking
Ubuntu 22.04 base with a Plex docker container. ZFS as the file system on my host
Can you send you docker-compose file?
Debian