The easiest thing to do would to use a reverse wind, reverse polarity pickup in the center position of your Stratocaster. I would not suggest rewinding or remagnetizing your older pickups, but to have a new one made for that position and keep the original one stock. Some players reverse the wires on the center pickup only to make it electrically out of phase with the neck and bridge pickup. If you have an unqualified repairman remagnetize the pickup to an opposite polarity, the magnetic calibration and strength can make the pickup sound too bright. And reversing the wires only make the inside of the coil nearest the magnets become noisy if accidentally touched when picking or strumming. If you find a good replacement pickup for the center pickup, it is an easy way to have a quieter humbucking sound in the # 2 & # 4 positions of a 5 way lever switch.