PhD forced out of university: Hong Kong
I expect that typical European professors will be sufficiently aware of the situation in Hong Kong to understand that some PhD students will feel pressured to leave; and to be sufficiently sympathetic to the democracy movement to not think any less of those students. Mentioning political pressure should do a lot to overcome the usual stigma against people changing PhD positions. That you have not actually engaged in activism is not going to be relevant.
Some universities will have minimum candidate periods for PhD students, and will be more or less flexible in waiving them for you. I would not worry about that too much in advance, contact suitable supervisors and ask about what accommodations can be made for you. They'll know best how to work the local administration.
Since you will want to complete a particular project for your PhD, you really want the right people as new supervisor. Someone who already knows your published work will be ideal.
For context, a few years ago the Saudi government decided that all Saudi-funded PhD students in Canada (of which there were a lot) had to immediately leave and move to a different country. While this was undoubtedly very stressful for the students, my impression was that there were plenty of understanding European professors willing to help.