This may not work, but if you could re-line or re-cover the shoes with a urethane strip. It may grab so well that the wheel will lock.
We use urethane pads at work to stop 100 pound steel tubes being drawn with 28,000 pounds of pull.We get the urethane in different hardness's and thickness's.We use 1" inch thick pads that are an "85" hardness.We did use "95" hardness but it was too hard and wouldn't grab enough.I can't remember the name of the company that we get the urethane stuff from.I think epoxy glue-ing it to the shoe will hold,thats what we do with our pads.Maybe use a rivet or small bolt too.I would only use this for stunt riding not every day riding.It may only lock up;no in between.Only do the rear brakes.
You may not need to cover the whole shoe either.
You want a urethane that's hard enough not to smear.
It holds up well to 375 degree steel being squeezed at 4,000 psi.Cut up some old skatebord wheels and make a proto type shoe.