This is already happening with more than ~80% of products that are "Made in Vietnam" and at least ~40% of products that are "Made in Korea." Not only do the raw materials come from China, but most of the work is done in China. The product is shipped overland from a Chinese factory to Vietnam or Korea, then some screws are tightened, some paint is slapped on, or a label is applied, and the product is re-exported.
Among other things, this is effective for tariff evasion.
And it's usually at least somewhat legitimate. It doesn't take much to make a product that's assembled in China "Made in Vietnam," even in a legal sense. Consider: https://casetext.com/case/ferrostaal-metals-corp-v-us
Basically, there was a tariff on Japanese steel. US-based plaintiffs -- steel distributors -- sent that steel to New Zealand, had it galvanized, and re-exported it to the USA as a "Made in New Zealand" product. A Judge holds that the galvanization process (which is laughably cheap) is enough to render the steel "Made in New Zealand."
When all's said and done, Chinese factories haven't slowed down and Chinese GDP is still rising (by more than American GDP) which tells you that the "decoupling" has to be in some respect illusory.