... it sounds like the solution might be to go full-on in the same direction, and then back to center. I need to try it. ...
Nope, does not work. There does not seem to be any way to cancel. As far as I can tell, once you go either part way, or all the way in either direction (for left or right turn signals), you are committed to a burst of three blinks, no matter what.
All you can do is get the turn stalk back in the center, so as not to overshoot to the other side, and as others have said, just wait it out. Ironically, while focusing so closely on the problem, I'm thinking three blinks is not all that long.
An overshoot, on the other hand, for three blinks in the opposite direction is probably so annoying because now the debacle has gone on for possibly twice as long, for as many as six blinks, with three in the wrong direction.
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