Get a used Micro Business PC & get your favorite debian based OS on it as the jellyfin-client are available in .deb in the git repo.

You now control your ecosystem and no longer subject to greedy 3rd party.

“blocks links to Signal” What does that even means? It’s not twitter; people are not sharing Signal links.

Yes, Xfce is lightweight; which may be seem crude.

If you select Mate or Wayland/Plasma then you would probably enjoy it more visually.

Once installed, you can select a new desktop environment at login. There’s generally a dropdown or menu item that would list all available.

With those other desktop env., you can say goodbye to that 0.7GB, though.