1. The scarcity is only because of the Reds incompetence. There were plenty of SS for the Reds to get, they just failed to get one. There isn’t a scarcity of SS in MLB that require Suarez to play SS.
2. Regardless, Suarez shouldn’t get extra WAR for playing a different position. What he produces at SS should be worth the same as what he produces at 3B in terms of helping the Reds win games. If he is terrible defensively at SS, he shouldn’t get bonus points for being a good hitter. All that should matter is how many runs he is creating with his offense, and how many runs he is losing with his defense. It shouldn’t matter where he is playing.
Now, maybe your math is correct, (I don’t think it is) but that shouldn’t effect individual player’s WAR’s. If the Reds get more wins by playing Shogo more because Suarez is at SS, then that will be reflected in Shogo’s WAR. Suarez’s WAR shouldn’t get a bump because of it.