Sharing videos from NewPipe to Kodi worked pretty well. But I switched too, after years of tweaking & fiddeling and I now use just an old laptop with Mint and a controller. It’s not as pretty and controller-friendly, but much more stable and I don’t really need the movie collection features.
I use phones that are at least 5 year old and cost 100€ max. Graphene supports only new pixel phones, so I never got to use it. I put LineageOS with MicroG on every phone and I’m super happy with it.