The sound quality solution is to ditch the AVR and use stereo. There is no such thing as an AVR that does not wreck sound quality. Even with bypass. Just don't.
Speaker selector that won't degrade sound
Is there such a thing?
Seems like many of them have relays or protection devices in them that will affect sound quality. Could I make one?
The reason for one is that my system is now a hybrid, my 2 channel setup and HT setup use the same front speakers. Have an Onkyo AVR with no pre-outs and a Schiit Freya+ as my 2 channel preamp, so no way of doing a HT bypass so I want to use a speaker selector and have both feed into the selector. Right now I literally swap the speaker cables at the back of the speaker.