Dan,
I wrote up a 'how to' adapt a set of bars to the V11. It's pretty easy really, and I used bars that were short enough that I did not have to replace the brake line. My cost was around $2-250US. It looks like the V11lemans webpage link is down (Jaap?), so here's some pictures on my website: http://plasterbath.chem.uiowa.edu/fairing/bars/bars.html
If you want a more ergonomic position, I would suggest higher bars than I used, and also check out Ian's adaptation of Centauro footpegs onto a V11. However, you also should look into the risers option. The biggest disadvantage of mounting bars is that you have to drill out the triple clamp. It doesn't compromise the strength, but you do have two permanent holes.
Cheers,
Jason