Sleeving is pretty simple. You would only sleeve the damaged ones. I would use aluminum sleeves so it wouldn't loosen from dissimilar metal expansion rates. This has already been done thousands of times in bearing housings etc. Your man will bore them out to size, then make 2 sleeves which are a little small on the id, then drill the oil hole, then press them in and then bore to the proper size. It won't take him long.