Don't think this tool of China blacklisting people should be so easily used. You have to remember China has to enforce its end and not do business with those companies that hire those on China's blacklist. Put too many people on the blacklist and it will eventually weaken it. Just like in China, foreign companies have more power at home. So there will be a point those US companies will not give up everything for profits in China. China should investigate foreign anti-China politicians to see if they're making money from China on the side and target them.
I think one thing China should and can do is to discourage its young people into studying in these anti China countries like us, canada, australia
Many of these countries rely on China to keep their universities afloat especially australia
Chinese students pays exorbitant prices studying in these countries and be treated like cash cows
China should really promote its students to study at home, educate parents that currently fbi is racial profiling Chinese students and putting them in jail
Also encourage Chinese companies to prioritize hiring workers who graduated from Chinese universities
Or even not recognizing diplomas from canada will certaintly halt majority of Chinese students from studying there