I agree with most everything, if not all of what you say. My only experience is that I had a 2x scope on a Ruger MK II. With that, I personally would try to avoid at all costs using it unsupported, offhand. Maybe that's me, but it showed my shakes too much and the field of view was kind of narrow. It worked for the purpose, which was rested hunting shots. Non rested, a dot of some type would be better. If the OP is going to mostly or completely rest the handgun, then on a bigger cartridge, some extra power could be used. Myself, I would be concerned that whatever is chosen has a long enough eye relief to use it like a handgun with arms fully extended. To me, it would be depressing to have to always shoot with your elbows bent to get the scope close to your eyes.
Danny