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Bad_Science
Can you get to it to drill a pilot hole in the remains of the bolt?
If so then something like this will hopefully get it out: https://www.amazon.co.uk/Draper-Expert-45856-5-Piece-Extractor/dp/B0001K9UEG
Advance warning, if you're applying some serious torque to get it out there is the possibility you can snap the extractor off in the remains of the bolt which makes a right mess of the job. The harder tool steel of the extractor is a nightmare to drill out.
Judicious application of PlusGas (not WD40) may also help.