Those pins can be pretty tight. I've got the correct Bristol socket and I've had the best luck hitting them with the electric impact. Seems the jar of the impact breaks them free easier than trying to break free with a wrench.
I think I read somewhere that one recommended procedure is to tap the wrench with a hammer or hit it sharply with your hand to shock the pin loose, instead of slow steady pressure on the wrench.
Roosa Master DBG pump a broken cam pin. Above thread has pics.
Going to try a sacrificial socket or a turned pc of heavy tubing welded into place then weld the inside. Barring that succeeding I'm told you might be up to it?