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You can get textured plasticky stuff that's designed for inside showers and bathrooms. Usually clear. A strategically shaped piece of that would probably work better on top of a saddle than the abrasive stuff. Still grippy, but wouldn't rub through shorts/pad.
Edit: although it's intended for use on flat surface, so some creative use of a heat gun might be required to shape it to the saddle underneath, to avoid it peeling away from the contours.
Wonder if that would work on a saddle. As long as it didn't instantly cause the Tony Martin aero flap.