If I understand correctly a hand detachable sidelock is not really any more meticulously engineered than a regular high quality sidelock. The difference being that on a regular sidelock a pin (screw) with a slot secures it, and on a hand detachable sidelock the pin has a "handle" lever that doesn't require a screwdriver.
Agree re sidelocks with hand detachable levers added to their retaining screws.
I'm referring to a boxlock with hand detachable locks. You take the forearm and barrels off, exposing a button on the bottom of the floorplate that when pressed, caused the front of the floor plate to hinge down, exposing the lockwork, You can then remove the left and right locks (hammer/sear/mainspring) as they are mounted to their own internal plate, which is why drop locks have not external pins on the side of the action.