This is what I do and if it's meshed it covers the bead flange too, just makes sense.
Try SAS systems, PROBEAD, we have had 12mm beads from them. Angle and stop. Google it mate.
Or why not fix your 15mm bead first, rendaid or high bond with mesh then mono @ average 10 to 12mm depending on base coat depth. Exceptions being ares where you might be cutting ashlar embelishments where you will need full 15 or 20mono depth, depending on ashlar depth,of coarse.