Yup, they exist, and pix have been published on here recently.
But it's adding weight, and we don't like weight, so I thought that in cases where a wide strap with neoprene or similar isn't enough, that one could have some artificial "sealskin" on the inside of the strap. That should give more than enough resistance, as the "hairs" will point "towards the upper horn" so to speak.
I'm gonna try that myself, and will report.