Hes played there sparingly in his minor league career, i think he was last utilized there meaningfully a couple seasons ago.
If they want to find room for a player, they will. They played Nick Madrigal at 3B for years which seemed like it would never happen because of his noodle arm, dont think they would be opposed to put Moises at 1B from time to time.
Also hes hitting .325 against lefties in AAA