IMO< its something that would just never work out in the real world, as many reasons come to mind
first off, your not going to get many folks to wear it, too many folks have there hunting gear(and public in general)
so, that will be a huge problem right off the bat, next is your going to have to sum how modify a LOT of firearms, and that is also something I gather most folks won;'t want to do!
IMO< rather than trying to invent something to prevent this from happening, maybe just spend more time learning HOW to use a firearm safely!
untill you can change the mind set of folks(nearly impossible too)
adding more steps to things, is never going to make it better!

the simple fact is, guns seldom EVER go off on there own, it take s a person to make them go off, and humans, make mistakes!, many don't bother to learn basic's, making it even worse!

I would much rather see , better TESTING< for gun owners, before being allowed to own firearms, a drivers test for vehicle,s why not a mandated one for gun owners!
I know this doesn't be liked by a lot of folks, this idea!
But after selling firearms for a LONG time, I really started to eel it should be there!
Add in doing range work and seeing folks shooting with little to NO training, or learning what is safe or not< and ???

making a laser or some other device ?? is NOT a viable solution at all IMO, just not going to work on the folks that have low skills and desire to learn any!, they won't wear it or buy it! IMO!