Get the WJ rotor and drill them. If you want, use an old hub and make a jig. The flange will center on the hub, and you can drill a couple 5 on 5 holes in the flange and put studs in it to further align it for drilling the 4.5" pattern. I then use a 5/8" rotabroach to drill the holes. I use a drill press, but I could as easily do it by hand. All this talk of spacing stuff with washers is killing me. This is the most important part of your jeep you are talking about here, don't half ass it.
Mark