I find the pole-raising and interesting approach to single coil. I've got the K-mod on all my G&L basses but one problem with it is that there is a certain amount of "leakage" between the two halves of the pickup. So that when you are in single coil mode, there still is some pickup from the switched-off poles. Still it gives a pretty nice sinle coil soud even with the leakage. And there is no hum unless you solo one of the pickups.
Raising poles (or ever better removing them from the unused side) is obviously a way to eliminate the single coil leakage and still keep the single coil pickup hum-free. The only down side that ruins it for me is then you can't go back to the agressive MFD humbucker mode.
I can see the idea of the phantom coil single coil pickup as great for a whole new bass with three those pickups. It would't be a L2x00 but it just might be killer cool as it's own thing!
I discovered the leakage thing last night - makes sense due to the MFD pickup design, but it threw me for a minute. I was trying to figure out which wires were N vs S start and finish so I can split the coils the way I want to.
Keeping the poles in and just changing the elevation a bit gives a bit of best of both worlds I think. The other thing is that by raising one set the volume drop is less when going to pure single coil mode.
I decided to get one 3 pole 3 position switch and have the pickups go to single coil mode (outer) in one position, humbucking in the middle and OMG in the other position. Might use .047 caps for OMG to cut the hum more and have less bass boost effect.
I had a custom template made for routing the third pickup cavity but measured the dang thing about a MM too large. I'm going to look for a router bit where the bearing is slightly larger than the blade diameter to compensate. I hope such a thing exists.
By the way, I had a helluva time finding the wiring code. This is what I think it is for each pickup...
Bridge side Start - Green
Bridge side Finish - Yellow
Neck side Start - Black
Neck side Finish - Yellow
Black and yellow are joined for the series connection. Grounding the series connection kills the bridge side of the humbucker. Connecting the series connection to hot kills the neck side of the humbucker.
I'm not going to bother with parallel mode.