Well the good news is that the Renthal 613 fits. The 613 seems to be the highest and widest Renthal as well.....
And, I am very suprised that it feels SO much better! (It looked like only being a very minor improvement.......) It is now much more comfortable standing up. RESULT!!
I had to re-route the clutch cable and switchgear wiring. And I still have a little finishing off/tidying up to do, but no wire/cables trouble lock-to-lock. As you can see, the clutch cable now goes round the outside of the fork leg,( not ideal..but you could always get a longer clutch cable) and the switch gear wiring goes down the inside.
BTW..there isn't much further slack throttle-cable-wise.........so I think if you did want risers as well, you would need longer throttle cables at least. I didn't have to shorten the Renthals after all. And I have the bars set slightly forwards for better comfort. I don't think I need risers now.
And I bought the wrong size wall plugs for fitting the bar end weights along with the Barkbusters,doh!, but have a photo showing what I am doing (no Barkbuster fitted in photo)