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Need preamp suggestions to suit NJ4's in a Jazz

you can wire it up in any way you want (almost any!)
for a two band pre:

V/V-Tone-T/B
V/V-Tone with A/P-T/B
V-V (either of the V with A/P)-T/B
V/T-Bal-T/B

most of these layout require a external battery box.
If you add a side jack, you might be able to fit both batt and pre with a 4 knobs configuration....depending on the conf.

...... and so on and on.....

Call the shop.