Deviate CDG to PVG on Cathay FC! You can buy the tkt right off their web site... Fully refundable and changeable...only gotcha is if you no-show...then a 500euro charge. I just did this last month....
As far as Deviating into China. It is no problem....BUT..as someone mentioned...you MUST email the ramp. This is so the ramp can send customs your O/B flight info.... This proves you are a crew member...Because your VISA is a crewmember visa only.....

Happy deviating...