Just found a site with a new style mirror extender in the States. Looks like they come with the mirrors as well. Not cheap at $99 + there's the postage and we will get hit with custom charges but I really like the design. Maybe they could be fabricated somehow.
Nice find Flatty though they are not as neat a design and I'm not sure about the fitments. I think I will more than likely go down the route of adapting GSXR 1000 mirrors with the built in indi's.