Those one-off shaft to chain or chaft to belt conversions are sort of like asking if you can put a Chevy 454 V-8 into your Dodge Neon: you have to just sort of make it up as you go. There is no kit, no set way of doing it, and no one can explain how in a couple paragraphs. Sure, anything is possible, but either you have the knowledge, tools, and fabrication ability to dive in and figure it out, or you don't. So dive on in. You might start by hanging out at the drag strip on bike nights and seeing if you can spot a drag bike poweres by a motor that came froma shaft drive bike. This will at least give you some idea of what you are getting into, and if it would be worth it to you.