Here's a thought, from Alex Lo…
It reminds me that Singapore under Lee Kwan-yu implemented a policy to ban any foreign funding of religions. That kept out the malign money from Wahhabi Saudi Arabia. I thought at the time that the rest of the west ought to copy Singapore. The policy helped keep multi-religious multi-cultural Singapore at peace. A price to pay is that you have to ban all foreign money for all religions. You have to do that to be, and be seen to be, non-discriminatory.
We could do the same with Alex Lo's suggestion: ban all foreign moneys from funding Hong Kong protests, not just America's.
