The main problem you might encounter is flat spots int grindind
and sanding. When cutting a cab, it’s desirable to have a
somewhat resilient surface, so that you get a nice curving
sanding surface, Faceting laps tend to be pretty rigid, and don’t
"give" to the curvature of the stone. You’ll either have to be
careful to keep the stone moving at all times, and sand
thoroughly, or get a pad to go under your sanding disks.
Food for thought,