This would be pretty cool, you could probably include both magnets and those Faraday shakers tied to a coil around the drive--but I have doubts as to how strong

This would be pretty cool, you could probably include both magnets and those Faraday shakers tied to a coil around the drive--but I have doubts as to how strong a field you could make before the overhead of shipping a portable, "hand powered" degausser would outweigh its usefulness.