I nearly did a P/MM setup on a custom bass and my plan was to use all Nordstrand electronics.
But to avoid the pickups being mismatched I was going to try to use a pair of MM4.4s (or MM5.4s if I did a five string) in an interesting configuration.
I figured I'd put a standard MM4.2 at the bridge and then have the Nordstrand crew stuff two coils of an MM4.2 into a Precision housing. I emailed Adrian and he said that was doable.
Then, since the standard positions for the P and MM overlap I was thinking I'd do a reverse P leaving the EA coil in the normal position but flipping the DG coil around to the neck side.
Add in a custom Nordstrand MM preamp with either a pickup blend knob or a 3 position selector switch and you'd have a unique P/MM setup.
I especially dug the idea after seeing johnk_10s Jazzmaster
builds where he used a single MM4.2 closer to the neck with a classic Stingray 2-band preamp and said he got very close to a P bass sound.
Here's a soundclip: http://johnkvintageguitars.homestead...udio/bass1.mp3
And another with a pick. In this one he plays the same four bars with the MM4.2 split first as a traditional P, then a reverse P, all coils in parallel (like a traditional Stingray), all coils in series and then back to the P bass setting. http://johnkvintageguitars.homestead...asswithpic.mp3