You'd think that with China's cavalier attitude towards intellectual property and trade secrets they would just copy one of the more effective mRNA vaccines and distribute it under the current Sinovax label.
In any case there are multiple paths available and so far they seem stuck on the failing one. It's strange.
I think it's easier to gain this information via hacking and data theft or paying insiders for documents than actually reversing the vaccine.
People in China are still posted about that.