Yes it was possible to use cryptocurrencies in China cause the banned are only on ICOs project and yet peoples still using cryptos in China which mean they cannot fully banned the used of cryptos in China.Bitcoin still being used in China and mining are very active in China so i dont think China banned would stop their peoples to used cryptos.
i dont know if you already heard the news about china banning mining and china banning cryptos and btc . they also banned ico on the past but now i still didnt get the latest info if what is their updates regarding on these banning but i can say that the use of cryptos on china is pretty limited or seems to be strict as when compare to other countries that dont have any issues related on the use of cryptos . including in our county the use cryptos are only growing and improving