I would actually love to find a way to avoid doing it. I normally DON'T have one, and for me, I think odds are I will NOT be able to execute it correctly. BUT, for faster bowlers, I do struggle, and often pick the short ball a bit too late.
A typical moment would be to find myself on the front-foot, and then say "oh sh*t" as the ball ends up being short - leading to an awkward shuffle back and an awkward defence. So, given the need for extra time to play the quicks, and the preference to NOT have a trigger (its not natural for me), I figured a compromise solution is to play my normal way (head still, etc etc, leaning forward), but to stand much deeper in the crease. This way, if I am caught unaware by the short ball, I have more time, and I'm already deep in the crease.
I don't know the coaches here, but would love to hear their thoughts on this. I read Buzz's suggestion to watch the seam of the ball as the bowler runs in, and will try it as well.