(I've never seen a vendetta
(I've never seen a vendetta in real life, so that sets an upper limit on how much this is worth, but
I've got to believe that you could rig something up. The more weight you'd want to carry, the more nervous I'd be, but between attatching things to the seat stays and the headrest, I think you'd be able to setup a rack that could hold a decent amount of weight...
Whether you'd want to risk it on such a nice bike, well, that's much more of a personal question.
Cheers,
Charles