I think the preference for on-campus interviews is mostly for more local candidates. Just don't forget to dress up for the Skype interview!
taken from: accepted(dot)com/chat/transcripts/2011/mba02022011_usc(dot)aspx
Michael Fowler: We do offer a variety of different ways that you can look into the interview. We always recommend that if possible, you come to campus because it's a great experience. You can also participate in our Ambassador Program in addition to the interview and that is always a welcome environment. We also offer Skype for those of you who cannot make it to campus. Whether you are outside of the country or from a different state or your travel schedule just does not allow you to, we prefer Skype. For a select few individuals from different countries where Skype is banned, then we will accommodate you with a phone interview. But for everybody else where Skype is available, that is what we prefer if you are not coming to campus for an actual interview.
For the MBA.PM program, I know a lot of graduate and current students in that program. It is definitely a much easier program to get into. Some admitted with GMAT scores less than 600. I think you'd definitely stand a chance.