I don't really know of any good way to remove the badging without marring the camera permanently. Why not just cover it with black electrical tape.or black it out with Magic Marker?
Another solution may be to use the neoprene camera skins, sold by many of the major camera retailers.
I have a 12,000 RPM side grinder that would do the job quick, but don't know if my hand is steady enough. Got a dozen or so cameras I can practice on?