The grip safety is going to be disactivated while you're holstering, so this doesn't seem like a good analogy.
A grip safety on the 1911 does not block sear movement or really do anything to prevent the sear from slipping off the hammer hooks. It merely keeps the trigger from moving.
The grip safety is not a safety and I would not allow it to "count" for gun abandonment. The thumb safety is the only safe way to make a loaded single action pistol safe.
I dont have a dog in the fight, but in many cases this is wrong, quite a few 1911's the grip safety blocks the firing pin. Alla series 80.
The Series 80 safety works by the trigger. As the trigger is pulled, there are 2 levers that work together to push up the plunger mounted in the slide. The schwartz safety uses the grip safety to push up the plunger.
The only safety worth a darn on the 1911 is the thumb safety. The grip safety is not to be trusted.
Rather than require a functional grip safety, have them abandon the pistol either at slide lock or hammer down on an empty chamber with the mag out?