great looking kit Waz, this is the next bass kit I want to build. Sounds like a cool option use the blend pot to split the coils of the humbucker. Then drill a jack hole. Special note Waz, on my JB build I should have drilled my jack hole further away from the control cavity to allow more distance between end of the jack tip and the last pot on the control plate. Sometimes my jazz bass short out because of this. I have ideas how to fix the problem.
Before you drill the jack hole, get a guitar lead and place the tip to find a place that won't make contact anywhere near the 4th hole on the control plate so it doesn't short out