China has not one insolvable problem, but many of them.
Yuan and Capital Flight
China needs to prop up the yuan to slow capital flight.
China needs to let the yuan drop to support exports.
China needs to float the yuan and remove capital controls to prove it really deserves to be taken seriously as a reserve currency.
If the yuan sinks, capital flight will increase and China risks the ire of US congress and those play into protectionist sentiment, notably Donald Trump.
Artificial stabilization of the yuan will do nothing but create an oversized move down the road as we saw in Switzerland.