I'm not chomping at the bit for a bolt on bass made in Indonesia at $999 either. The use of a hot jazz pickup at the bridge is an intriguing idea. The higher output should blend better with the split coil. I already have an spb-1 in my precision so I might try the sjb-2 hot jazz with it too. Think one master volume and a three position switch would be a good way to wire it?
With the several P/J's that I have I find V-V-T or at least a V-blend to be the best option. I prefer to set the P and then blend in the J until it gives me the desired effect, and full on isn't always it. And of course, vice-versa
Using a hot jazz will give you more output but the tonality also changes and you get those boosted mids with it, which may or may not get you what you want.
Manufacturers are getting much better at matching their P/J sets. I have an Aguilar set with a hum cancelling J and they really did a good job getting the outputs to balance, plus soloing the J is noise-free.