Hey Contingencies, are you talking onshore/offshore China RMB? If so you should know offshore RMB capital flow is strictly controlled by SAFE (State Administration of Foreign Exchange). RMB is NOT freely convertible and is designated by the PBoC as a restricted currency (even though it is in the SDR basket). Look up QFII its one of the few legit ways to move or repatriate foreign capital into/out of China. CNH (offshore RMB) deposits ARE freely convertible and major banks do offer conversions.

Im not totally sure where you think there is a missing gap, but happy to talk more. Email in my profile.