any of the above methods may work. If you don't want to cut into your stem to get a good slot for a screwdrive, the extractors are your best bet. That or drill it out and put a helicoil in there.
I would just use a left handed drill bit. It turns in the direction you want the bolt to go, out. When you get the bit in far enough to grab, it just turns the broken bolt out.
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