I thought about doing something similar, but I ended up using the drum. I didn't chase it too far down the hole, but you'll have to find a sprocket that you can bolt on, and you'll also have to check to see if it needs a spacer to line it up with the sprocket on the motor (probably needs a spacer...a large one I would think).
You can go ahead and order up a custom one from http://www.rebelgears.com/ as well, they can cut whatever you need. You'd have to figure out a spacer system, but that would just be some lathe work.
Now that I think about it, I was thinking of using a front mag on the rear... I just like the skinny look and larger diameter wheel. Front spoke would be the same sort of deal, though.
You can go ahead and order up a custom one from http://www.rebelgears.com/ as well, they can cut whatever you need. You'd have to figure out a spacer system, but that would just be some lathe work.
Now that I think about it, I was thinking of using a front mag on the rear... I just like the skinny look and larger diameter wheel. Front spoke would be the same sort of deal, though.