I have small hands and have to rotate most any gun in my hand to reach the mag release. We got a bunch of mag release extensions at work to try on our Glock 21's. The theory is good but in practice they don't work. Your thumb can reach it better and it's a larger more positive target for the thumb but if you push the back part, main reason for it in the first place your putting it into a bind. Most wanted them on and after shooting with them had me take them off.
Your idea of using our support hand with mag in hand is sound, I just accept that I have to rotate it, and move on.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."