Arks don't really scratch the way that backing is. Sometimes you get the wrinkle grooves from repeat use on hards but not really scratches. An ark glued to a good quality bhone isn't the dumbest idea ever. Can use oil on both, the ark would tamp down some of the more undesirable aspects of a typical bhone edge that you usually need to stay on a strop longer than you typically would want to in order to reel in.