As much as I'd love to have a play round with different wiring setups the fact that I'm massively over budget with this one I just can't go and buy a 4 way switch just to find out it the tone variation is negligible.If it was me, I'd install just the pickup and then use some clip leads to try the different coil combo's to work out which are worthwhile (green-red pair for south, white-black pair for north etc), then install the control plate with a 0.022 cap and only if it's too bright switch to a 0.047. Also, 500K pots help humbuckers keep some brightness whereas 250K pots will reduce it slightly.
I'll definitely try your idea in regards to the different caps and see if there's any noticeable change though, also I already scored some Bournes mini 500k's right back at the start of the build so they'll be going straight in once I begin wiring.
Cheers for the handy info man.