> What can an individual do to help Hong Kongers? Any suggestions?
How many firearms, and ammo you can buy, and how many politicians you can lobby? Even if you are a single digit millionaire, that's just enough to arm, and feed no more than a single lightly armed battalion for a few months.
I see other option than a military solution, either limited, or not.
Even if any Western power decide on half hearted piecemeal solution like smuggling weapons into to China, and rile up the populace, it will only bleed China a very, very little. China easily endure waging a civil war the size of Syrian, and continue growing economically like if nothing happened.