Since most of my pistols don't have a front sight that can be drifted, I usually only drift the rear sight, IF needed.
I know about nothing when it comes to cameras in phones, or other devices, but I do remember a time when good cameras were usually 35mm film and many of them had a timer. And were also threaded so they could be mounted on little legs so you didn't have to hold them in your hands...
I am a bit curious about your grip. I admit to not being up on the current idea of "proper" grip technique, and I'm wondering why you think you need your support hand to contact the gun (at all?) and why you think lifting your shooting hand (reducing your grip on the gun) to make room for your support hand is the right thing to do???