CHEAPest way to convert rear axle bolt pattern to big bolt pattern???

If you don't need the strength or a posi, I'd just go & find a late model 7 1/4 A body rear & install it as an assembly. Got to be a few of them out there in the junk yards or I'm sure a few members here would have one to sell. A lot less hassle than getting axles redrilled & welded & drums drilled & hoping there is enough material on the flanges. Probably cost you about the same anyway since it's not a desireable rear. I'm not sure the 7 1/4 axles have enough on them like the 8 3/4 does to be drilled.