As others have said, this is almost certainly not possible:
1) If 4-4 was an option, people could just take the free MD and run.
2) If you take a 4 year break from clinical medicine before intern year, your clinical skills will be rusty, your knowledge will be outdated, and programs will not want you. Many residency programs specifically state that they will not consider anyone who graduated with the MD more than 2-3 years ago, so if your program conferred the MD before you began your PhD, you would be SOL.
3) If your PhD goes anything like mine did, you would not have all of your publications out the september before you graduate. Your publications are what people generally care about - they are the only sign that you were a productive PhD student.
So...no.