The Custom Shop can do it, but it would be a different style single coil. It would have a base magnet or two, like the
Dimarzio Blaze single. That's the only way to do it.
The other alternative is to put two rows of screws in it instead. If you do that, you need short screws (same length as FS) or you simply cut the screws short with a nipper or cutter. If the screws are long like a PAF, the tone will change because the magnetic field will be elongated. That short, tight magnetic field is part of the Full Shred's magic.
Personally I like the look of the FS with regular Alnico pole single coils, but also with rails pickups, like the Cool Rails or Vintage Rails.