Never seen one! Interesting; looks like it fits into the stock bolt hole? If you have a straight shot at the cavity from the rear as in that bottom pic maybe you can get some version of a mechanics internal bearing puller in there to help pull it back out. Some have 2 or 3 spring loaded jaws that are forced outward when you insert the tool. Another option might be some kind of an expanding mandrel; a round apparatus that expands when you tighten the bolt, which would grip the inside of the tube.
After that comes epoxying in something to act as a puller, then when its out you use heat to make the epoxy release, but this requires getting inside for cleanup with a scraper to get out the epoxy film.