I learnt yesterday that BTCChina doesn't accept HK bank accounts (whihc is very unfortunate). As an SAR HK residents have far greater privileges with regard to forex, so it would be interesting to know what exchanges are popular there.
Hadn't known about the BTChina/HK disconnect, but maybe these guys are looking after it, they have a money services licence from taking a glance.
https://anx.hk/