If there is any of the air screw protruding beyond the threads you might be able to get a small Dremel cutting wheel in to make a slot for a standard screw driver. IF not you might also try (no kidding) a left handed drill bit and slow speed.
Additionally I'd heat the carb in the toaster oven a little as this might loosen the fit of the threads around the screw and make removal easier and wear gloves!
In any case be prepared to loose the carb body.
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