But, they definitely want their fiat currency to take its place. If one of the BRICS countries had to impose the new fiat currency standard, it would probably be China, and I'm thinking they'll use everything in their disposal to accomplish it, and they won't just give up to bitcoin.
They don't want that. Fiat as a global reserve currency is a historical anomaly. Gold had that role for thousands of years.
We're going back to the Gold Standard, only with a digital twist this time around. History will repeat itself.
Countries with big BTC reserves will claim that their CBDC is more "valuable" vs others. You've heard this here first.
Also, China is not like USA.
USA imposed the dollar not just by force/military violence, but also via entertainment/cultural warfare (Hollywood movies describing the "American dream" and even
cartoons depicting greenbacks -> they try to brainwash impressionable little kids and they're pretty good at it judging by this forum)!

China has nothing like that culturally (and besides that, most people don't speak Chinese), so you can forget the yuan conquering the world.
This does make some sense, but on the other hand, the overwhelming advantage of the fiat currency is to be able to rob the wealth of other countries. If you're limited to only your own country, the gains are significantly reduced.
They don't need to rob anything when they have valuable resources to trade.
Russia has wheat/oil/gas.
China has electronics and
in-house microchips (not as advanced as TSMC's so far, but you can imagine what will happen after Taiwan's invasion -> they just want to reverse-engineer ASML's EUV machines).
Imagine if the collective West sanctions/bans Made in China electronics... imagine an nVidia GPU skyrocketing from $500 to $10000 in a single day due to scarcity!

People will remember the 2013/2017/2021 GPU mining craze as something insignificant compared to what's coming next.

I definitely expect the West to shoot themselves in the foot once again -> hyperinflation kicking in -> no more fiat/cash -> welcome CBDC.