Condition 2 is pointless and potentially dangerous. If you buy a single action pistol, and live somewhere that allows you to carry it, do so properly, Condition 1 if readiness is required, Condition 3 if not. If readiness is not required, why bother carrying a great big hunk of metal. In which case, lock it up. To be clear, there is exactly one way to correctly carry such a pistol, Condition One.
Note regarding half #### - the half #### notch is a safety device, intended to prevent the gun from firing if dropped, as such it is not a place to put your hammer while you make up your mind if you want to carry a loaded gun in a proper fashion. Deliberately carrying a gun on half #### is the dumbest thing you can do. Hence we have an expression "don't go off half cocked"