Given that the Voyager has roughly 3 x the fuel capacity of a Victor, it is difficult to imagine any potential conflict which would require the aircraft to be operated in the receiver role, given the cost of installation, testing, maintaining proficiency etc.
It is difficult, BUT when I was sitting in a nuclear armed Valiant on QRA and someone had seriously suggested that a V bomber would be used to bomb a tiny British Island in the South Atlantic and need 12 tankers to get it there and back, I think we would have assumed the guy really had flipped under the pressure !