I once spoke to a Chinese EC135 pilot who said it was possible to work for foreigners as long as they spoke Mandarin well enough to deal with ATC. But this is literally hearsay, sadly I can't point you to the exact regulations.
There supposedly is an american instructor working a Cabri G2 in Qinglong Wan, a small airfield near Hangzhou. The company's wechat is VinciHub. I also know a guy operating 139s in EMS and could potentially put you in touch. My wechat is krautland.