What? Why? I don't think he's a 3B, but spending 3 extra months playing 3B twice a week instead of 5 times isn't going to meaningfully change his outlook at the position.
Are you drunk right now or something? Because suggesting that the team call him up for meaningless baseball in September and then make up the service time by optioning him for two weeks in 2019, 2020, and 2021 is one of the dumbest things I've ever read on this forum.