Literally buy from PRC... most of worlds largest trade partner. That's why the system should work, it's closed loop. And we know world aktually fine with yuan denominated trade since PRC increased yuan settlement from 10 to >50% in a few years after US went sanction happy. PRC basically super costco, apart from chips and commercial aviation (both coming) they sell everything country needs for modernity, at discount.
They do not need to liberalize currency. They just need to have stuff people want, and leverage to force them to transact in PRC preferred currency. Previously this was hard, PRC had goods, and affordable prices = reduce friction/switching cost vs USD liquidity, but USD liquidity still made USD transaction preferred. PRC had no leverage for others to transact in yuan.
But in persistent high global energy environment, if PRC controls basically global supply of cheap renewables... and 30% of GCC oil vs Iran enforcing petro-yuan, they have stupid leverage to snow ball system. Again key is this for 30% of GCC oil exports if Iran locks down (big if), it's not global petro-yuan, it's Costco membership only access petro-yuan.
30% of global oil is inelastic existential survival leverage, if PRC wanted to charge in blowjobs countries would pay in blowjobs, currency liberalization doesn't matter when selling water in desert.
For that 30% control number to make any sense you have to believe that: the gulf states are going to allow Iran to control their existential oil trade long term, that they will do so in the face of a currency getting manipulated adversarially against them, that no manufacturing bases can be built up to be alternatives and that none of that is going to have major impacts on the economy or political elites in China.
All of that happening with the worlds biggest oil producer, its second biggest manufacturer, who is food independent and has the worlds most powerful military just lets it happen. And no shooting war breaking out between them.
I’m betting on slow currency liberalization and a transition to a multi currency petroleum industry and subsequent inefficiencies in global trade. But feel free to bet how you want.