In the event of slippage of a rigid grit covered roll, it will likely sand a gouge in the part. How about a urethane rubber covered roller?
Another process which I could call DIY, because I run a well equipped shop would be flame sprayed tungsten carbide bearing powder. Usually a flame sprayed (also called metallized) surface is machined smooth after application, but in the as-sprayed state, it is rough as 100 grit sandpaper.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)