I currently have it exactly as you plan and it works wonderfully. Kodi runs on the Pi continuously and everything is possible on it (TV, movies, series, music). Currently Entertain, but it wouldn't be a problem if satellite ever comes along.
The note about the speakers is also good, I installed them directly in the ceiling and will install the multi-room system in the technical room.
However, you have to keep in mind that this is already a "DIY solution," if I ever want/need to sell, I might have to think about something here. [emoji6]
Regards, Christian