4.5" bolt pattern 7.25" rear axles

I finally found some old timer at the local tech college who says he can re-drill and it will be cheaper in the end than sending it to Moser (shipping both ways). But my wheel mounting flange is definitely like the flange on these:

http://www.forabodiesonly.com/mopar/showthread.php?t=190427

So how do you re-drill something like that? Is there some geometry magic? Enlarge/offset center the stud holes all around or is that enough meat to rotate a few degrees and drill five new holes?