Yes, as long as they can afford the billion dollar cost to change the software.
Japan has always wanted the F-22, since (from my knowledge) 2007.
Who knows but if we and them want to make the sale, and congress agrees, it will happen.
Spread out over enough aircraft, a billion dollar charge is not prohibitive. Then again, the F-35 is developing into a potent warfighter and may be enough for Israel and Japan.