It's not hard to reholster your gun without shooting yourself. I've been doing it with all kinds of Glocks for over 30 years.
If you are in a tense situation where you can't look down at your gun and holster to make sure nothing is going to pull your trigger when you reholster, you aren't supposed to reholster. That is a rule you shouldn't break, if you are not the police.
You'd be better off learning to be confident in your gun and skills than trying to shortcut confidence with gimmicks.
Bren,
We all can acknowledge the remote risk that we'll ever be involved in a self-defense situation where it will be necessary for us to draw a weapon. Yet we who CC do so in order to be prepared for what could be the worst day of our lives. It's no great leap of imagination to see how, in such an instance, it might be necessary to hold one or more BGs at gunpoint until LEOs arrive.
Everyone who has been hanging around GT for even a little while understands they don't want to be the one with a weapon in their hand when the cavalry arrives. That, to me at least, screams a one-handed re-holster. With adrenaline pumping, fine motor skills impaired by vasoconstriction, and possible auditory exclusion, I may or may not have the opportunity to pause, look down, and calmly watch my weapon back into my holster -- especially if I need to keep my eyes on the BG(s) and arriving LEOs.
No more a shortcut to confidence in gun skills than carrying QuikClot in my IFAK is a shortcut to medical school. Both are just an extra layer of protection.
Again, no right or wrong as to whether people choose to have or not have the SCD on their weapon. But it's nice that all of us have options.
Best to all.