Is it reasonable to think that an in-office procedure can correct significant asymmetry after my BA with BL two months ago?

Without seeing you or a picture of you, it is hard to tell you specifically what would work best for you or whether an office setting is the best place to do it.  It is not unusual to do minor revisions in the office under local anesthesia.

First, it would be helpful to see your pictures.  You do not need to worry about an office based procedure as many surgeons do perform these.  If your surgeon has been doing this for 30 years, as you say, then he most likely knows what he is talking about.