I didn't realize that the bars clamp over the steering tube; I thought they would be inserted in it.
Therefore, I like your idea of building clip-ons over a faux triple; that's a cool look, and it's adjustable.
Here's my tubing roller:
http://www.harborfreight.com/catalog...=tubing+roller
You can find good deals on clip-ons on eBay, and use those for raw material for your project.