I'm speculating, but I think the size of the touch of glass might be too big to be properly exposed if you went with micro instead of mini. I am sure it could be added, but might not give the proper effect - worth requesting a sample from the installer to look at ahead of time if you go that direction.
What I found out is if you add anything to micropebble you will negate the warranty. I was hoping to just add some extra blue glass beads or even an extra bag of the glass bead mix that they already use in micropebble. Wanting to make the white a tiny bit more blue. NPT said no, and my plaster company said no, so I guess I have to just accept the white as is .