Henry, a warm welcome to MCM.
Yes, it is possible to come into China on your own bike, but unlike other countries, you have will have to do it with a tour guide, you can't ride alone. And yes, that will be expensive. This has been discussed before here on MCM, but I can't remember the thread.. I'm sure more members will chip in with more info soon.

Another good forum for RTW touring is http://www.advrider.com/forums/ .. though not as China specialized as MCM.

in the meantime, is it possible to tease us with pics, even a bare frame or an engine sitting in it's crate is enough to make us drool..