I think the only person who hasn't actually tried to address the original subject on this thread is @nooby_mcnoob, actually. He/she/it projects a lot.
I'm curious if there are any second order impacts beyond the obvious of shorting the index, i.e. industries or sectors that are to some extent dependent on a mostly autonomous Hong Kong?
The obvious are the equity index and the HKD. There are also HK bonds but I have no idea what impact a crackdown would have on them. The Chinese yuan and equity indexes should also be effected. I think there would be a chilling effect on Taiwan markets as well.
As for specific sectors, that's a great question. I don't know.