Peter A Goldsbury
I think there would be major problems with applying the international regulations to Japan. The organizational structure of the Aikikai in Japan is far more fluid and contentious than is commonly acknowledged. People overseas might have the image of a smoothly running organizational machine, presided over by Doshu, and the annual jamboree known as the All-Japan Aikido Demonstration might seem strong evidence of such an image. However, the reality is somewhat different.
The All-Japan Aikido Federation is a very ghostly organization. As I was once told, and by an Hombu official, no less, this organization has no real substance. My own dojos, for example, are not members. In fact, we are functioning quite happily without belonging to any organizations at all. We are independent with a direct line to the Aikikai Hombu. So I myself do not belong to any of Mr Tani's four categories of 'official' shihan and this is just fine.
Of course, that's the major catch. Even outside Japan, the Aikikai has, in reality, very little leverage that is not given to them by the organizations themselves. Still, once they put things like this out there it is inevitable that people start to question the fairness of the policy.