forget the heli bars, woodcraft sells 1/2", 1 1/2" and 2" riser clipons for cheap.
just installed 1 1/2" ones, they are really nice. 1/2" would be perfect, i had to actually mount them a litttle lower on the forks so the controls would clear the fairing.
50mm clip on risers. you just have to drill your own holes for the control nubs(easy) and mount your brake reservior to something. i drilled/tapped a hole on top on the clipon clamp.