[nickrego]

I own an antique Balloon Protector. It’s hanging on my office wall along with a vintage mask as a display.

Short of taking it down and trying it (would be a real pain in the butt to do), I don’t see how you could use a BP with the Gerry Davis stance. The straps just aren’t designed to put your hands on your knees. I would think that in order to be able to do so, the straps would have to be set so loose that it would not sit up against your chin. And your hands are not available to hold it in place.