True but Scott (northwoodgt) and I have had this discussion. No one has come up with replacements the way they are pressed in. I may recall someone in Europe having someone come up with something.if it came down to it I'm sure they are replaceable, they just don't want you to replace them.
If I understand what you're saying, knurling the bore would reduce the bore diameter, thereby recreating the interference fit.He pressed many bushings of different materials in and out of the A-arms during that time, and he said that you can only press the bushings in once, because the aluminum A-arm points deform under those stresses, and if you press a bushing out and press another one in, it doesn't fit as tightly.
I have done this method on my Porsche 993 track car with good success. I replaced the OEM with poly bushings.Here is how to remove without heat. Take a drill and a 1/8 bit. Drill onto the rubber bushing numerous times clockwise causing the rubber to become removed between the inside metal sleeve and the outer metal once the rubber is removed the inner sleeve will fall out. Then scrape the rubber out this will let you work on removing the outer shell of the bushing. You can then scribe the outer shell from the inside not cutting into the control arm and the shell will remove with ease. I have used this method on early Bronco track arm bushings. Hope this helps. No heat if use this procedure.