Good luck I hope you are successful!
I’ve broken a lot of bolts over the years, even titanium (when I was building airplanes). When I was serving the apprenticeship to be a truck mechanic I learned how to blow a broken bolt out of the hole for an exhaust manifold on an American V8 engine using an oxy acetylene cutting torch. Of course the cylinder head was cast iron, which is something that can’t be done with bolts in an aluminum head.
And of course I’ve also been in your shoes, trying to remove steel bolts stuck in aluminum from corrosion. Not a fun time, to be sure. Even less fun when one breaks and you have to resort to left handed drill bits and “easy out” extractors.
Patience pays dividends here. So go slow, stop if you’re unsure, go have a cup of coffee or a beer, then try again.