The problem with strategy is, China might collapse far quicker than the "other side".
Did you know there were police officers in airports in China who were questioning the outgoing Chinese citizens, stupid shits like "Why are you leaving China?" (like why would anyone leave our beautiful country wtf is wrong with you?)
Would the authority which doesn't want you to leave the country let you move your wealth out of the country freely? Even though this was just an act?
A big NO. The moment they make this possible, every Chinese with a little bit of life savings would want to leave that hell hole. It will just backfire.
Don't get me wrong, China deserves plenty of criticism, and I am not a fan of the CCP, but your all or nothing approach to this situation leaves a lot of room for a lot of what I am describing in between. They don't have to be 100% trustworthy or 100% open for this strategy to work. One thing they are already using is having a domestically used yuan that is heavily restricted and an international yuan which is dedicated toward international use. They could easily adapt that strategy to these scenarios. I think overconfidence in their impending failure is a mistake. They only need to last long enough to pull this off, then their plan would run under its own momentum.