Or be are there on a government invitation, or even maybe have a China passport.

Oh, USD 300 per ticket is significantly less, than the whole trip, including the stay would have cost.

You can always wait until the day of flight, and see, whether CX (or other airline, when applicable) does cancel at their own initiative, in which case, you get a full refund. Given the China way in handling the back to normal of the Covid-19 situation, it is quite likely, most flights into china will be canceled for the more than foreseeable future. Let alone, IF one segment of your itinerary is moved or canceled, you can apply, etc. Keep in mind, February is mid-winter in China, and it is highly likely, Covid-19 will see significant flair-ups in the Northern Hemisphere, including China, which in turn significantly increases the chances China will panic-close the country even further. This patiently "waiting" is the option, I would choose.