Twisted Throttle might have bar risers for the NT. One thing to keep in mind in although most bikes, such as the NT use 7/8" bars, the dimensions between the bolt holes for the handlebar clamps can differ. I'm fairly certain those dimensions are the same on Honda motorcycles with 7/8" bars but they can differ on other brands. A good pal had some risers for his SV650 Suzuki that he let me borrow and I found the dimensions differed.
In regards to ordering other handlebars, it's all about the rise and the pullback which is often a furrin lingo to most people. And the "other bars" won't be drilled for the locating pins used on Honda controls. In my opinion, using bar risers is the easy way around this problem.