Imo, he 100% needs to start at AAA until he is comfortable with that new swing. No sense in getting random at bats, maybe 3 or 4 a week, and sit on the bench the rest of the time.
At this point, I'd rather Perkins starts out on the opening day roster and go from there.
Wiemer needs seasoning, what he was doing last year won't work on the big squad, so he needs to fix his issues in AAA.