There sure is a good number of HK donation websites popping up here and there since the fiasco, but I'm personally more comfortable in donating through the Human Rights Foundation. Idunno, I'm more comfortable donating through them as I feel like it's more guaranteed that my money is going somewhere.

Also, their CSO, Alex Gladstein, is an avid bitcoiner!

https://hrf.org/programs_posts/hong-kong-desk/
https://hrf.org/donate-bitcoin/