I'm generally a 'can do' type of guy, but for stuff like this I say leave it to the professionals - especially since old dirty fingers are a bit tough to get hold of and do sound really nice.
The Dirty Fingers I have is tapped at 7.5k - I'm assuming they all were and am therefore a little confused at why you want 4-conductor wiring ???? If yours isn't tapped, well that of course would explain it.
btw, my BC Rich rawk-machine is back with an old made in Germany Floyd installed and the Dirty Fingers - its a great rock guitar. which BKP (at the risk of a thread de-rail) is closest to the Dirty Fingers? - Holy Diver maybe?