The UK has already allowed open immigration from Hong Kong, specifically in response to the Chinese National Security Law, but I'm not sure that this is really any solution.
That one is only for holders of the BNO passport. The passport is only available for registration before the day of hanging over to China. That means youngsters born after 1997-07-01 or those whose parents did not apply for them are out of luck.
t. non-BNO-Holder.