I know these are for guitars 500k and 250k but I'm always looking for pots with switching.
I recently bought a pot from Weber that was of high quality it had nice DPST switching such as used for MV/boost switching in Fender Pro Reverb amps.
1 Meg audio or linear pot with push pull switch (DPST) https://taweber.powweb.com/store/potsord.htm