I had a similar issue where I wanted to use my Xbox Series X to play Jellyfin but there was no client available. I ended up switching from Plex to Emby. I tested it for a month and then bought a lifetime pass, I’m quite happy with it. The client definitely isn’t as polished as Plex’s clients are but they allow me to do everything I want with much more control. I especially like the plugin system, being able to create my own persistent 24/7 faux tv channels is A++

I tried to find out how DAP identifies users and I think it’s based on device fingerprinting rather than IP address. So, I think, if you were to use two separate linux devices to access a .gov site using DAP it would register as two separate users. I don’t believe frequency of use matters.