What country are you in? Does your domestic model come with bars? If so, you might be able to find the parts at a salvage outfit.
The best way would be to swap upper triple clamps (and bars/clip ons) with someone with a handlebar equipped model. Then the cost would just be the shipping - unless you find a local interested party.
If you don't find any takers - which I kinda doubt would be a problem - you could drill your upper triple and mount bar clamps to it.