That would be fine with me. I think they should weigh all passengers and charge by total weight and girth with the first 50 pounds, 3.6 stone for royalist, going free. And any diameter over 30 inches waist should also be charged. Of course, some would cheat like Jerry in a Seinfeld episode where his vanity had him sewing 30 inch tags on his jeans that were clearly quite larger
. Whatever machine does the body scan could have software for assessing body girth and weight and charge accordingly.I think I probably have around 500 dives on my first Oxy textile plate and around a hundred on the other two. They are just so light, stable, comfortable I cannot see going back to any sort of metal plate.
Allen Klauda used to make vintage type travel harness using two cam bands and cotton webbing. The cam bands can go through the slots in the wing, strap on the harness and off you go. A plate is really not needed. The tank becomes the plate. The soft plates, like my Oxy type I love, their purpose is to spread the load and provide attachment points for a standard Hogarthian single piece webbing assembly (which a vintage harness is not Hog being multiple straps) but it is still the tank that provides the structure.
Maybe use a three piece harness sewn in with those horrid Fastex clips for adjustment. Sew the waist strap in and then two shoulder strap loops in.
