Grisly, I have not read through this whole lengthy discussion but I did see the post about an amp switcher, If this is still in play, may I suggest one called Solupeak P2.
It is an Amazon choice item, currently priced at $66.40 and has no meters. I purchased one to switch between my big (old) Yamaha and my Emotiva A2 amps.
It works like a charm and appears to be of decent quality. So far, has worked flawlessly in my system.