I had the same problem a few years ago when swapping bolt heads to change caliber. I wanted to salvage the components to use in the replacement PTG bolt head. Never did get it out. Changing Harris bipod feet, I was able to push the pins out using a punch press. It was awkward and required four hands to maintain punch alignment, but it worked. Maintaining alignment on a bolt head is more than I can manage. Maybe requires a jig of some sort. The downside to abandoning the effort is that sooner or later, the ejector recess hole will collect enough crud that it will reduce it's travel, and need to be cleaned out. It takes a while, but I'm always surprised by the amount of debris that's in the spring and recess.