Yeah, that bird won't fly. PIC is only if you are rated in the aircraft, and you won't be without the checkride. I can appreciate the difficult position you're in, but if you do your MEI as the initial instructor ticket, you may need the 15 hours to be proficient. Not sure what's on the MEI initial, but the add-on is a cakewalk in terms of time. Less than 5 hours if you remember how to fly a multi.