Yeah, B, that's a great idea: Get one of each and it's NOTHING to swap them back to front. It's gonna take longer to unstring/re-string than to unplug them and switch them. The crazy thing is you only remove the two screws you can see, swap them, put the two screws back, and they're still in EXACTLY the same height!
The BigRedBass is a long scale, standard Omega shape, so my neck pickup is in the traditional spot, next to the truss-rod cutout at the end of the fingerboard. I basically set my heights with the neck pickup about halfway between the top of the body and the bottom of the strings, and the neck pickup halves that height again closer to the strings. My trims are set with a slight rearward bias to add that bridge pickup zing on top of the front pickup beef. I have the 4-way selector, no pan. I originally tried the AXY in front with the FatBoy aft, but the FatBoys are so delicious to me I prefer them in both places.
I would rather have a little too much of something and thin it out rather than having to really boost something that is barely there. I'm finally to the point I want as little tone modification as possible, and I preferred a little thinning to a lot of boosting. My friend Bob likes 1 and 1 on his fretless, which I could see for him. Bob has VERY good ears, not surprising as the rest of him is first-class, too.
J o e y