S-1 Switch Help

[canbaz]

I have a fender deluxe strat so the S-1 switch. It is H/S/S but its bridge pickups is changed to Duncan Hot rails. Now i want to change its bridge pick up to a single coil. But i'm confused; if i change it, i think i will lose some S-1 options. How can i wire a single coil without losing the s-1 specials ? Does someone have any idea or any schematic ? Also a good schematic with Bridge-Neck parallel can be useful.

Thanks.