But... AFAIK the Chinese with money enough to play with Bitcoin doesn't need the Chinese banks for nothing, they have money scattered all over Europe and US. The ones fully dependant of Chinese banks barely have enough for rice, leave alone Bitcoins.
According to Bobby Lee of BTCChina, at the height of the bubble he did some demographic analyses of his customers and the vast majority (+95%) of them were upper-middle class retail investors, not institutional investors. Most of these people do not have foreign bank accounts.