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I am sure a professional with a "super" hard drill bit can drill a hole and extract the broken bolt out.
This is the cheap man solution but use it as a last resort. It happened to me with the exhaust stud on the om603 block. The stud broke and ditto the drill bit. I used this method and it worked but use it at your own risk. I used acid to dissolve the broken drill bit. I dripped acid into the hole, a few drops a day and the acid dissolved the iron. See whether the bit is loose after a few days and then try to wiggle the broken bit out. The acid may also dissolve the aluminum, it shouldn't but it did. So you may need to retap the hole afterwards. Good luck.
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