I was really not familiar with the original design that you gentlemen are talking about, but it does sound pretty safe as long as the half cock notch works correctly. I have taught many young folks shooting and hunting with Handi's and the like for 30 years or so, and was only familiar with the transfer bar system. I like the transfer bar system and the margin of safety it provides. Trigger pulls on NEF/H&R are really good as well. (Exceptional for the price of the firearm, in my opinion.)
We all know (I hope) that proper gun handling trumps safety devices and nothing is fool-proof, but I do appreciate anything that is designed to be safer and add a margin without changing the performance.
The specific idea put forward in the original post however, is still not something I could ever endorse.