Hi BarryM
Yes it is possible to do the same mod to Futaba servos ( I don't know about these digital servos) The 2 3000 series servo I took apart, ( to reverse the action) had different colour wires on the internal pot, one was red white black, the other red yellow blue, so I can't be sure of that. However the wire that goes to the wiper of the pot, should NOT be altered, just the other two. Hope this is of some help
tom