Not sure I exactly follow your design concept....?
Oh, it's not MY design concept, they're already out there. I'm referring to the triggers that you have to push forward to lock the jaws on the string rather than pull the trigger to open the jaws, and let go of the trigger to close them.
It just seems to me that the "push forward" designs "snap" back when you touch them off, as opposed to squeezing the jaws open in the other design.