I would think a good machine shop could set up the axle and carrier and do a line bore; and make a new, oversize pin to go into the standard bushings, as long as they weren't worn out too badly. I would have an spare pin made and have them give you the size of the final finish bore so that an extra part could be made in the future, if need be.
This is an expensive way to repair the problem, but probably worth it in the end.
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