I don't think it can be done in FCE/P, you might be able to try laying a filter over it to get the grain feel, but the DOF aspect would be extremely hard to get in post unless you really get involved with it in after effects. You could try searching around
http://dvxuser.com to see if it is possible.
If you have yet to shoot, your best bet would be to rig something up, probably would take a little effort and penny pinching. Or you could pick up one of these if you have a 35mm lens laying around:
http://jag35.com/new/products/student-bundle/. That or a redrock or letus....