Given that you have 24-month unlimited entry visa and make frequent working trips into China, you might make a strong case to a vehicle management bureau that you qualify for a license. Just be sure you have a valid US motorcycle endorsement. I've never heard of a visa with duration of more than 1 year, so you may have to get someone from GE to explore this with the bureau. GE of course has considerable clout in China.

Once over that hurdle, you should have no problems. In fact, you could buy a bike and register it with a Chinese friend/colleague/GF.

This may not be as hard as you think.

good luck.