If enough skin is used for the skirt, the clamps could be placed farther away from the tacking area, or the gluing area. This would allow the extra skin, where the clamp is placed, to be sliced off of the final fitted head, if desired. The consistency of the metal also adds to the uniformity of the form of the tacked, or glued area, on the shell. The clamp could be bent and modified to fit into a crease a drum may have, if it does have an out of round figure. But that may not be completely necessary, as the head, tacked or glued, will probably fit and adhere to a slightly out of round shell just as well.
Hose clamps have an added advantage of being side screw tightened.
The driver is angled away from the instrument shell avoiding the possibility of scratching the shell or puncturing the head, with careful toolmanship. It should be noted however that with barrel shaped drums there will be a slight angle at the area where the clamp is placed. This is unavoidable but not of dire consequence unless you are tightening your head using extreme pressure from the clamp. Then you will have a line on the head where the clamp metal is placed. If too much pressure is applied the clamp could possibly cut into the head, if it is thin.