I think if you pinch within fraction of a second after a minimum time previous gaze, and before another minimum time next gaze, it would work really well.

These minimum gaze times could be quite small. When we move our eyes, they move fast. I am guessing in the order of 10-30 ms. Just under our perception of what we are actually doing.

I find myself deciding and starting to pinch, but moving my eyes away at the same time. That is a small window where carry-over gaze would reliably do-what-I-mean without undercutting a follow up gaze and pinch