If on a scale on 1-100 in difficulty (for either side) if this is a, say, 50, Taiwan/PRC will be 100+. 200 miles long, almost 80, 90 wide, 15,000 square miles, 100+ miles of water between them. Glad I'm not in plans and ops.
UK has greased the way for volunteers to go.
In other news Shell has pulled out of Russia, ceasing it's operations, and Maersk is considering not delivering to/from Russia or transporting Russian goods.
That difficulty and those details are the reason I don't think China is going to use this as a cover for an invasion because of the amount of equipment and men that will need to be assembled- and that would be seen by all sorts of people, govt and NGO, very quickly. That's not to say a blockade couldn't happen to choke them.