Only a theory
Some thought on the matter.In my way of thinking,right or wrong,it would appear to me that an off-set pin would be an easier solution than welding up the holes in the wheels and recutting to any degree of accuracy.
An off set pin is not that hard to make,the alignment could prove to be a challange though.You would have to be right on the gnats ear ,so to speak.It's certainly not a job for the shadetree mechanic nor could it be done in an hour or two.
One theory,although I doubt I ever do it,is to cut an oversized pin,harden it,then press together and tack weld one side.Chuck the whole mess in a crankgrinder and grind the off set desired.Un press it,fit the rod and repress.Might work might not.
You could also off set a pair of center holes in the pin and grind it down with a toolpost grinder but then again you have the problem of alignment.It would take a center in one end of a 4 jaw chuck than had been off set and a tail stock with the ability to be off set .Lawdy that alone would take two hours to dial in,at least for me.Again no way is this easy by any stretch of the imagination.No doubt a guy would end up with a lot of "paper weights" before the desired outcome had been reached.