I don’t want to use Osmc or LibreELEC. What I’m going for is something like Android TV (tried using LineageOS but that didn’t work out for me).
I was interested in something like Plasma Bigscreen but most of the tutorial is about 4 years old and point to using an old image.
I installed the Debian package. After that, I logged in and set Automatic login, and switch the session to Plasma Bigscreen (x11). After applying and a reboot, it launched Plasma Bigscreen but some widgets (like the audio, KDE Connect) froze when clicking on them.
What do you recommend? I prefer to use a Raspberry Pi.
Have you tried Jellyfin? It’s a FOSS fork of emby, so pretty much a drop in replacement and it’s been working very well for me.
Personally I use jellyfin as a backend, with the web interface and jellyfin app as frontend. Plus Kodi as an additional frontend for my beamer, with the Kodi Jellyfin plugin and Yatse remote to make it feel more like a TV.
I tried Jellyfin but had many issues, then tried Emby and it worked first time. Since then I’ve purchased Emby so no point going back. The OP probably has an Emby license so no point changing to Jellyfin now.