you can do it it's actually rather easy. Just take off your current swingarm, grab a powersaw and cut it in half. Next take a safety pin and kinda stick it in there somewhere where it will stay. There you have it
The rim certainly brings attention to what's been done to make the bike different. I wouldn't spend anytime trying to engineer my own single swing (and I'm an engineer), I'm guessing it's easier to find one off a Ducati or the likes and make it fit. Let someone else do the majority of the thinking!