Replace the Tone pot with a push-pull that will do a coil split. That's what I'd do. In fact, a friend of mine modified my Washburn electric so that a pull of Tone pot will do exactly that to my humbuckers. We also did a neat thing, if I select the neck pickup, and pull the Volume pot, I get serial instead of parallel wiring of pickups. AND this works with coil split, as well (Brian May tone, right there). Extremely flexible guitar, now! Give it to someone who knows wirings. No fear there, then. This is the best thing I did for my stock Washburn, which was really simple (just neck/middle/bridge switch, no coil tap, no series/parallel). It's a tone monster now.