No option for your cousin. As always with Hiromoto, a strong asymmetric grinding, asking for a strongly asymmetric edge. Neutralizing by thinning the left side behind the edge and recentering the edge is only a short-term solution and will require great sharpening skills further on to avoid crazy steering and wedging. Better have an inverted blade as offered by Masahiro and Misono -- but these only on special order. That's going to be a very expensive present, I'm afraid.