If there's nothing sticking up you can drill and try an e-z out . There are spiral and square. By using the square e-z out you can turn it both ways. I have had to remove thousands of broken/stuck bolts/screws.
I was stationed ar little rock afb ark and we sometimes had to go out to the acft and remove igniter plug mounting holes. These were on a t-56 turboprop c-130. To get the bolt out you had to use a snakedrill and a mirror and it had to be perfectly straight and had to be drilled out and retapped. You have to start out EXACTLY on center or they had to pull the engine.
When i say hammer on the stud i mean LIGHT hammering not heavy you are just trying to let the pb work down into the threads.
As far a lister flying it might if you hooked a JATO pack to it!
i use to have a side business of removing others broken bolts, drill bits , e-z outs, or taps. I can take them out without damaging the parent threads.