Sounds like you’re going in a relay direction, but fwiw i’ve been keeping an eye on analog switches recently and the TMUX8212 has unusually good specs. That’s a quad N.O. Looks like you would parallel the switches in a dual N.O. / dual N.C., which would be the TMUX8213. I don’t know how its charge injection stacks up against some of the alternatives suggested here, but the off isolation, distortion, Ron, and Con are all attractive.
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