Pretty sure that if you buy just the pot you will have to remove the old pot from the existing harness and solder on the new one. The 1-volume harness would allow you to simply unplug the one with the bad pot, plug in the new one and you are ready to go. Result will be the same. A lot of the Alembic electronics are modular which makes it easy for an owner to fix problems with little to no technical expertise. It also reduces the probability of owners having to ship the electronics to Alembic for repair.
Good to hear you should have your bass up and running again soon!