.............what about welding........
I would agree that boring the sleeves out is probably best and as we do them most often; but I have seen them heat/weld shrunk out; this by laying lines of weld material deposited starting at the bottom drawing a bead to the top, let cool, and test for movement possibility, if not lay down another strip 180° from the first, let cool, test for movement, if not rotate 90° and so on until they fall-out. Just be sure not to penetrate the sleeve and manage to weld it into place! Now, once you start this process you are going to be committed to it, because no machine shop is going to take on attempting to bore them out once you start laying beads of weldment in there; and it's going to take more shrinkage than the .001" - .003" interference fitment as the sleeve isn't going to shrink evenly and will be distorted out of round and square in the vertical.
Not to mention, it's going to look like a real 'Farmer-Jones' in the barn sorta execution. but I have seen it done!
Scott.