Coil tapping is completely unnecessary if one wires the 5-way as a standard single-coil Strat and employs a Q-Filter (on a push-pull tone pot or mini toggle switch). And, 450s are among the last pups Id consider tapping. Also note that 450's are optimised for 250K audio-taper pots. HTH.

Aide toi et le ciel taidera (Aid thyself and heaven will aid thee)