Need advice: damper bolt hole in crank damaged

Sadly BTDT. Luckily I was able to get my recycled head bolt out out as I think it was just wedged at the very bottom of the hole.
At least with the damper off, you have a little room to work. If you can get enough of the shank out you may be able to use a thread insert. Problem is it'll be somewhat large and using a hand-held drill trying to make a concentric hole won't be easy. Instead of shortening the crank bolt you could space it out with washers.
I work for a NASA contractor and almost all of the threaded holes that fly have inserts. The Keen-sert style only.