Good luck with this fantasy.
The yuan (actually, called the renminbi when it is traded internationally) trades at a fixed exchange rate.
It will never work as a reserve currency unless it is allowed to float at a free market price.
It doesn’t have to be THE reserve currency. There can be more than one.
The thing that would kiss us would be issuing a Yuan tied to a fixed gold value. And China sets the value of gold. It would be a parallel currency, used for external trade only.
It’s an “out there” theory…