Here are a couple places that might be able to help with rewinding vintage pickups. I admit I've never used them, and I couldn't find any information for them on the web. I took these from some older (8 years ago) Vintage Guitar Magazines. They may be dead ends, but then again might be worth checking out. Good Luck.
J. M. Rolph
Rewinding Service
"Specializing in Vintage Pickup Rewinding/Magnet Charging"
P.O. Box 259
Melbourne, KY 41059
Phone: 606-781-9334
Players Precision Coil Engineering Company
"Rewinding all types of Guitar-Base-Piano Pickups"
5057 River Rd N
PMB 155
Keizer, OR 97303
Phone: 503-463-1997
Koz-Ax's Guitars
"Your Vintage Guitar & Bass Part Connection"
Phone: 800-814-0432