With the J4s there's not as much of a difference between the neck and bridge pickups as with the wide apertures. But the bridge pickup is wound with thinner wire. But you can use two neck pickups.
Have you (or anyone else reading this) tried a ND3-J neck pickup in the bridge position?
I should add that I want to use my "quad-coil" configuration totally passive, straight to the output jack, with some type of undetermined switching system. This is for a 32" scale bass, both ND3-J4s placed somewhere between typical MM Stingray position and bridge...favoring a placement towards the bridge end.