Any help would be useful diagrams?
With a full 4-pole switch, it's easy to figure out a routing – just assign each of the wires coming out of the PU a pole.
Then for each setting of the knob, you can freely decide where the signal should go. You'll definitely want the standard serial wiring (i.e. opposite coil polarities in series, so the opposite magnets will bring the signals in phase)
and probably also the brighter-sounding parallel variant with the same phase
Extend to other wirings as you see fit. Single-coil splitouts are the obvious third choice, followed by out-of phase arrangements. All of these are frankly much less useful though in practice – an out-of-phase humbucker sounds extremely weak/thin, which is particularly bad since, like a SC tap out, it doesn't actually humbuck anymore. So, a more practical alternative migh be to offer a whole bunch of variations on the serial circuit, with different capacitors to short out the high frequencies from one of the coils.
All of these woult be mostly hum-free, but in the crucial midrange the capacitor-shortened coil won't contribute much so it'll actually sound more like a single coil.