I recently went with the option of buying a top yoke conversion kit from cool n comfy (
www.topyokes.com) for £312!!
At the time I knew it was expensive but it seemed the simplest option, if not the cheapest.
It came with the top yoke, Renthal bars and Hel braided brake lines, and longer throttle cables.
So far I have had to wait an additional day for the brake line (Not a real problem), but since then I have tried making several attempts to make contact with them but no real success.
My biggest problem is trying to refit the front brake master cylinder. where it is normally bolted to the right handlebar, there is nowhere to fix it to the Renthal bars. As the master cylinder has to be mounted higher than the lever it seems it is a bit unusual that there have been no instructions or pictures to show how to overcome this problem.
Can anyone help? Once I have overcome this small problem the bike will be finished.
Then I just need to find new bar end weights as the originals do not fit into the new bars.