VIP Back wheels are rare for starters, so getting the one you have fixed is a good option. (I've never trued a wheel before, but plenty of other people could).
You can also modify another wheel to fit, look in the direction of other Garelli bikes and Tomos wheels. Most of them will have a smaller axle and are more narrow, so you will need spacers. They won't go right on, but you can get them to with the right thinking.
Treats or quarterkick would have a chain, performance pipes are usually itty bitty speed pipes, not great. In the hack and weld custom department you are indeed in good shape because your header can be positioned almost anywhere under the bike, left or right because of the screw-on attachment.