If you are not in the mood for doing much tinkering, there is a German electronics manufacturer called TechniSat and they sell a multi-function radio called DIGITRADIO 3 VOICE. It has an offline voice assistant. The voice commands can be used to pause, change audio source, increase volume, etc. The radio deck has okay-ish sound, I wouldn’t call it hi-fi but it doesn’t sound like two tin cans. The function is actually for blind people (I bought one for my grandma who is legally blind), but I guess privacy enthusiasts would find it adequate, too.