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Interesting. I'm using the "sling-shot" method but I kind of stumbled into it.
When I first started shooting handguns, I used the shooting thumb on the slide release. This is how I was shown. When my wife got her Sig P938, the slide release was too hard to work so one of the range instructors showed her the "sling-shot". I found myself naturally following the same method.

Regarding the shooting thumb on the slide release. I don't think it is messing with my grip. My routine practice drill is 3-5 shots with a two handed grip. Then I rotate my power chair and take 3-5 shots with my dominant hand fully extended, then I rotate in the other direction and shoot with my dominant hand over my lap. Finally, I practice several different positions with my non-dominant hand.

I think this is a way to build muscle memory that applies to several different situations.

I doubt that my physical abilities will allow me to survive past the 15 rounds in the gun but if they do, reloading is not going to be that critical.