Single volume harnesses are not in stock (meaning the ones we've made are reserved for new builds coming up), but can be ordered.
The original 2-volume Persuader would have 100K volume pots. The single volume harness uses a 10K (and all the bits on the board as well). FC is correct that you want turn down the gain on the filter pot preamp since you will be using the pan pot preamps now. Putting a little sticker over the trim control after you turn it down is a nice reminder to leave it alone in a few years.
You can keep your 2-volume setup as a spare, add a filter to it for another project, or sell/gift it to a fellow club member.