I feel like they could call him up and play him every day no problem. Unless you think Julks should play every day instead of against just lefties. Which I guess he has earned (for now).
Edit: very small sample size for both, but he's definitely better against lefties than righties. Could easily platoon with any young lefty (Colsa, DeLoach, Fletcher, Sheets with Colas at 1B) and it would be fine.