CC
The A330/Voyager/MRTT operate fully compliant with civilian performance-not the ancient rules applied to the KC135.
The only stopper for refuelling a V22 would be the AAR speed -is 180 KCAS too fast for a V22 and where is the evidence that a KC46 could do it any slower?
The KC46 doesn't seem to doing too well in the refuelling stakes at the moment.