There were a number of expatriate helicopter pilots working for Bristow and COHC in China a little while ago, but now I believe there is only one remaining with COHC. Britow pulled out of China some time ago. CSHC at Zhuhai is expanding fast and although they don't have expatriate pilots at the moment I understand the door is not shut completely for them - particularly those with S92 C&T experience.
The Bell 429 is selling well in China as a private helicopter (supplementing the existing 206L4's and 407's) but I'm not not sure if this presents an opportunity for expatriates - can anybody confirm/deny.