Howdy longuito,

I think you will probably get a lot of mixed stories on what you want to do. Legally bringing your motorcycles into China is going to cost you far more than the value of the motorcycles. I'm not even sure you would be able to bring the CBX in because of it's age (emission laws are very strict on motor vehicle imports). If you can get the Africa Twin to Hong Kong, it can be illegally imported for about $3000.00 USD. Once you get it in, you need to get fake paperwork etc. and this will cost you about another 600-800 USD. If you run across the wrong cops on the wrong day, your bike will be taken away and you will probably get booted out of China.

You're coming to China for professional reasons, so it's not worth risking your career playing games with questionable vehicles. Shanghai is one of the most biker unfriendly cities in the world, there is little hope of riding your bikes there, and trailering is not possible because trailers are illegal in China. You could get a cheap truck to move them around, but it's not a really good option.

The next major hurdle you face is a license. Your residence permit is going to be issued in Shanghai, so you need to get your license issued by the appropriate authorities in Shanghai. A far as I know, Shanghai won't give you a motorcycle endorsment. I could be very wrong about this, try to check with some of the guys up there. They might be able to tell you how to get around this. Getting a license or registering a bike in another city is probably not going to be possible for you because your residence permit is based in Shanghai.

What you could do is buy a couple of China bikes (JH600 or QingQi 200 etc) outside of Shanghai and get a local person to register them in their name. This would keep you from having any legal troubles as long as you can also sort out your license issue.

A word of caution. Plenty of people come to China, do questionable things, and get away with it. China has changed A LOT in the last year and foreigners do not have the "special status" they once had. As a professional working in China you need to be a little more careful about your motorcycle plans than the average person that just comes through on a tour.

Good luck with your adventure
Cheers!
ChinaV