https://libreelec.tv/downloads/
These both run Kodi which can run Jellyfin
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I found the DietPi OS to be great for getting a media server going. Alternatively, just install a lightweight OS, install docker, then set up Sonarr / Radarr / Prowlar / Overseerr (or Jellyseerr) / a torrent client / Jellyfin using docker. Make sure you transfer the OS off the memory card though, they eventually corrupt if you run the OS off them. Not sure about a remote, Plex let's you use the android app to fling media to another Plex app on the same network, maybe Jellyfin has similar?
Jellyfin Media Player is the main desktop app, but if I were you I'd probably set it up with LibreElec and use the Jellyfin Kodi plugin, since you're looking for sort of a console-ized setup for your non-techie friend.
Now all that said, the Roku app is great and you could definitely just get your friend a Roku Streaming Stick+ and set up the JF app on it for them.