You can change pot values...that's how I made my 1K Push pull Harmonic switch control on the blueteleful Telecaster (see link below)...
A push pull pot can be taken apart carefully...but fairly easily. Inside is a kind of circuit-board-like plate with a carbon strip circle on it that the 'wiper' turns around on...this provides the resistance.
The trick is to find a 10K pot that has a compatible plate in it of the same standard size (not a problem) and same or similar wiper style (so the same brand may be necessary)...
Take the 10K apart and replace the Push-pull pot's carbon strip with the 10K and you have a 10K push-pull pot...
My Sustainer requires a 1K audio taper...so the same kind of problem...
Hope that helps...it's not hard to do...a lot of pots are different and there may be a little modification required...but generally you can fit them all back together...
pete
Great Idea
Thanks Pete