They would no reason to trade cross border using cbdc crap if they dont already plan to force the same thing to people, or they could trick the people in using it because it's ''safe and effective'' 
I am sorry to say but people in China already bought all that crap about safety, without thinking much about the consequences.
I have a Chinese friend who relatively recently left China (like a year ago) and still baffles me how things that we see as an attack on our privacy and freedom he sees as something good and that will keep him safer. And its one of the main complains he has about living here in Europe.
Funny thing, he does own Bitcoin and keeps it on the exchange as he thinks its safer there despite me pleading to move it on his own wallet.