Well, good-to-great suggestions all (except the tattoo part...I'm not a tattoo or piercing kinda guy). While I was waiting for the suggestions to roll in, I acted on one of them to see how it worked.
AWESOME so far.
Took the maple/maple/block neck off of my passive Precision Special (I have two, the other is active) and replaced the neck on the fretless MIM Jazz.
Ho-lee-poopie, people!
MIM Jazz, black finish with white pickguard.
Maple MIM Precision Bass Special neck with maple fretboard, black binding and block markers
Lindy Fralin split-coil Jazz, 5% overwind in bridge position
John East J-Retro preamp
Babicz FCH bridge
It barks, growls, it thumps...and it looks sleek doing it. Pictures as soon as I can.
I could play this one for a while...for reals. It'll take a bit for the neck to settle back in and get the action and intonation set properly (doing it by hand and ear for now), but it already feels nice.
Hey, and I got a fretless Precision Special out of the deal.
I wonder how often this will work to assuage GAS...just rearrange the parts in the basses you already have?
The only drag was getting out the plastic shims that some luthier had GLUED into the heel of the pocket...I couldn't get the new neck to have high enough of an action initially, and getting the shims out without gouging the crud out of the pocket was a pain.