Also, I wouldn't really worry about Chinese firms being locked out of "90%" (???) of the world's economy, we are already seeing circumvention of certain Chinese firms which are blacklisted due to their business with Russia (like Deepcool, where a third party retailer began reselling their products on Amazon after being banned from the US:
)
Chinese firms can continue to "Singapore wash" and try to legally distance themselves from China, while still acting as Chinese firms, hiring Chinese talent, and taking advantage of Chinese supply chains and human capital (like Shein and Bytedance):
Ultimately the US needs to have alignment with their allies and the administrative capacity to keep track of all these firms and play whack-a-mole with their sanction policy, otherwise it'll prove to be ineffective, like what we're seeing with Russia currently.