1 start a week at each of those positions is 4 starts a week when there are typically 6 games a week. Get him 2 DH starts, and a 1B/LF/RF start a week, and that is five starts a week. Slot him in around lefties and opportunistic righties, and you have a pretty easy path to 400 to 500 ABs. There is nothing wrong with getting guys like Abreu and Eloy some days off too. Conforto can rest against lefties easily. We currently don't have a real DH.
Again, if you follow teams like the Dodgers, Rays or Yankees, they do this all of the time.