is it possible to weld up & re-drill a differnt bolt pattern on a aluminum rim???

[hottrodd57]

I bought a set of mint condition of 15X7 aluminum 5 slot rims made by "U.S. Indy" with chevy 4 3/4 bolt pattern. but I didn't check all the rims when I bought them (took the guy's word) but one has the ford 4 1/2" bolt pattern, I want to know if it is possible to weld up the current holes and re-drill them to the chevy 4 3/4" bolt pattern???? has anyone done this, or is there a company that can do it? I can weld up the holes myself, but it seems to me that I would need a jig or something to make sure the hole are put in the exact place ,so the wheel will run true. any helP!!!!! if it can't be done, does anybody have or know someone who has any 15x7 U.S. indy rims with a 43/4 bolt pattern????? have been checking ebay, but now luck!!!