Yeah, come to think of it I think he would call it 'Vintage White'. Good examples on his site are here:
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The first and fourth one are both, I believe, Vintage White. The first is really a pimped out "light" version, while the fourth is a brooding "dark" version. Both make me literally drool. If you can get him to do this color in semi-transparent, I guarantee you'll have the pimpest P-bass you've ever seen. Even if he sticks to solid, I just find this color to be "it" for me.
As for the NP4, he probably doesn't stock them standard, but I see no reason why he wouldn't be cool with you ordering one. It is indeed passive. IMO, if you're getting a +1000$ bass, you should spring for a pickup that really sings! The sound a 1/4 lber makes is IMO simpler and you could get a similar sound out of a cheaper bass. That's totally my opinion and others would probably flame me for saying that. The NP4 is designed to be "vintage, with none of the disadvantages of vintage", and it is really a sweet pickup! Although I suppose the 1/4 lber might be closer to the tone you'd expect from an American Standard off the shelf. That's speculation on my part.
Ok, maybe I should stop whispering in your ear now! I'm living vicariously through you. Whatever you go with, you'll love your Landing bass 100%, I'm quite sure of that.
(But PS: I'm playing my p-bass with DR Sunbeams, and I can honestly say my p has never felt so alive! Thomastik-Infeld Jazz Flats are also incredible with a p if you want to go flatwound).
Oh boy oh boy oh boy...