I don't see how applying to their PB program is going to prevent you from getting off the waitlist. Either you are going to be accepted fully, or you are not, I doubt that will be even considered. The reason I say this is your application to which they can base their opinion has no information on it about doing the PB, you aren't accepted to it, you haven't started it, you are only applying... It is entirely likely the people who take the aps for the PB program have nothing to do with the DO program... I say apply...