I use my old BQ E5 as a music station. I bought some years ago a pure bluethooth speaker (https://www.teufelaudio.com/uk/bluetooth.html) and the ut-BQ is just laying on the living room table and can be connected with it and plays music files, radio stations, can be used as a KODI remote control or anything else.
I deinstalled all ut apps without media functionalities and just have pure music apps installed - and nothing else.
Why I write this? It's just an idea to offer a specific UT which can be downloaded and installed on old phones to be used as such a music phone (like e.g. sparky is offering a specific multimedia debian: https://sparkylinux.org/download/rolling/)
And I like that much more than having a lot of electronic equipment in the living area. Old phones (also with errors) can be bought cheap and also old bluetooth speakers are having less electronical components and so a lower ecological footstep.