Obviously there will be a currency risk, I'm willing to take that. But wouldn't your scenario mean that I would make extra profit (I would hold CNY while CNY increase in value)?
Actually it would indeed benefit you if RMB increases in value - but I would caution not to leave BTC or RMB (or USD or any other currency) in an exchange for a long period of time.
It actually is very easy to open a bank account in China (you just need to bring your passport with you to a bank branch) so maybe you should consider setting up an account here (it's also possible to get very good interest rates for savings at the moment).