Hmm,older Dukes,(Pantah's and the like)had a neat little lever mounted on the clutch assembly,like this.
I dont think it would fit a 749/999 tho.
How about this sort of thing?
As used on old Brit bikes,MZ's and some BMW's.
(Can also be seen on some petrol lawnmowers as a throttle!
)
[Edited on 6-2-2005 by KeefyB]