A maple neck is a really nice alternative if you're used to rosewood boards. Both my Strat and my '51 CIJ reissue P bass have solid maple necks... in other words no maple fingerboard on top of a maple neck. Something about this just feels really organic and wonderful to me. I think most maple neck basses have a maple board laminated on them, but it may depend on the model. I think it affects the feel, so that may be a factor to look at, but having a maple neck bass in your arsenal is totally logical.
As far as sound between a P and a J, I've always found the P to be more balanced. The J can do a pretty good emulation of a P if you solo the neck pickup, but the minute you mix in the bridge, things get more complicated. You gain crispness and snap, but to me is drifts away from that fundamental and starts to take on a sort of "scooped" sound. I absolutely hate the sound of the neck and bridge on a J at even strength. When I had the Jaco, I usually just dialed in a small amount of neck pickup and used mostly the bridge with the tone rolled way off (not totally, though). That sounded pretty good.
On the Tony Franklin fretless, I don't use the neck pickup at all, only bridge. That pickup is very hot, and you can get plenty of low end from it with some tweaks to the amp. I run the tone at about 45-50%, so a touch brighter than the Jaco, but I think I run the treble on the amp a bit lower, so it evens out. Historically, the knock on P/J configuration P basses was that the neck pickup overpowered the bridge. The TF solves this with its super hot bridge pickup, but I still hate the sound of the two pickups together. Worst of both worlds, imo. That's why I kept the switch instead of converting to a blend knob. If I ever want the sound of the neck pickup, it's there for me, but my fretless sound is largely the bridge pickup soloed.
It may be worth trying some P/J Precision basses, but it sounds to me like you want to try something different. A maple neck Geddy J would probably be a nice bass that could be had for a very reasonable price. Keep us posted!
Bill
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