I've had an idea. If I bought this:
"KU1 Pickup
Twin coil, twin bladed humbucker yet only the size of a single coil pickup, so it's ideal for use when you don't want to modify the existing cavity. Four wire connection. For neck position.
Black cover. Alnico magnet."
Then would it be possible to wire it up so you can use one of the coils as a single coil and then switch it so you can use both?
If I put 250k pots in instead and then had it so when I bring both coils in I have them in parallel, would that work?