Okay, this has been fermenting in my haid all night, and this is my thinking on drilling the pin: by drilling a blind hole into the pin just deep enough to get a pin or other straight sided punch in there to drive on the bottom of the hole, it might have the effect of stretching the pin enough to reduce the diameter of it ever so slightly, and getting the taper to let loose of it; it might even work without the heat. You may have already gotten this thing all done, but this is something to file away for future reference.