Some Scott releases come with a spring that replaces the the trigger.This is how I cured my punching problems years ago. What works for me is putting the pin on the target, holding firmly against the wall, and slowly pulling the spring while mentally thinking aim, aim, aim, until the shot goes off. I've never been as consistent with the push-pull method but everyone is different so try both ways and see what works for you.
A surprise release will make you a better shooter because by the time you react to the shot the arrow is already gone. You won't be able to affect the shot by grabbing the bow or tensing up as you release because you don't know when its going to happen.As statedin another post, start up close to your target until you get used to it.
When you get good at it you will be able to do it quickly when you need to, like in a hunting situation. And once the surprise release is acheived make sure you never go back. If archery had a ten commandments I think #1 should be ; Thou shalt never punch your release. Never ever.