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

I took a look at a 7 1/4 axle, today. There really isn't enough meat to just redrill the flange for the LBP. As another poster stated the hole in the flange to remove the axle flange nuts i the main problem. It really should be filled, then you have no convient way to remove the nuts.
Best to just get a LBP 71/4 "A" body rear.