You can try and hit up Sean over at Sunnyoaks Muffler on Camden at 17. He might have the right size die. http://sunnyoaksmuffler.com/Home.html
Sean does a ton of fab work, rock crawlers, suspension, etc. Thats why I suggested contacting him. Just give him a phone call and ask.
Might also add that your looking to bend TUBING, not "pipe" (at least, I hope not). I know that sounds like me being a grammar nazi, but there is a major difference in the two. Tubing is measured by it's outer diameter, pipe is measured by it's inner diameter and wall thickness is measured by it's "schedule". In other words, a tubing bender won't bend pipe very well, and a pipe bender won't bend tubing very well.
I've got big hands but I don't think they would fit handle bars that big very well. What are you trying to build that you are using structural pipe rather than tubing?