Frankly, it doesn't make sense to materially (as opposed to morally) support extranational protesters just because they agree with you on something. Moderate-sized protests on a variety of issues routinely roil Chinese towns without anyone noticing, and there have been multiple waves of large anti-quarantine protests during the pandemic that had similarly localized motivations and aspirations. There's just no true mass movement that unites the Chinese core. Looking for ways to sustain given protests would do nothing against the government while harming long-term relations, regardless of the situation in Ukraine.
Since you mention Hong Kong, that the US bloc did little of anything during calmer times over the repression of a clear majority of a peripheral part of China, should indicate the impossibility of salutary measures on behalf of an indeterminate subset of the mainland (who are nowhere near as put upon as Uighurs anyway).
(By the by, it doesn't escape my notice that every time unrest flares up in Iran, the usual suspects heartily support Iranian protesters transitioning to insurgency against the IRGC in between calling for brutal crackdowns on American protesters who aren't even within an order of magnitude in violence of action.)
As for Chinese economics, it relies on agglomeration economies, which make it hard not to do business in China for many types of manufacturing. Every supply and value chain runs in and through China, an efficiency multiplier the CCP has carefully cultivated over decades. The TPP and derivatives were meant to reduplicate that agglomeration across a politicized bloc, but without the political pressure of American membership the logic of markets will disinvest only slowly.
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