I'm not sure if this should really count (though nobody's really counting these days anyway) since I reloaded a few times early on to work out the best early game strategy, but I think it does show that a Chinese OCC spaceship victory is doable on Monarch, and not too difficult, either. I founded Beijing 1E of the starting location; Tianjin, 1SE of the start, might be good as well, but I'm not sure which is better. I sent the starting warrior to India, getting him promoted to Woodsman III along the way, to capture some workers as outlined in usi's UHV guide. The initial tech path was the same as usi's as well, up through calendar, and the initial build order was similar (except for settlers and extra warriors, of course) The Oracle was still available after I traded for Priesthood, so I used it to get Construction and build the Great Wall. Next target was Civil Service, followed by Drama, then Education, Liberalism, Astronomy, Railroad, Medicine, Rocketry, and Computers. Spaceship techs after that, starting with Ecology and Genetics. Once I had all the spaceship techs, I changed some farms to workshops and watermills and let the city starve down to size 20 to maximize production. I launched the spaceship with 1 engine in 1986, and it arrived in 1998. No one else launched before then, though a few other civs had started building their spaceships.
Despite China's being less isolated than Japan, for example, I never had too many problems from the other civs. Mongolia started out at war with me but never actually did anything. Japan declared on me a few times in the 1800s; each time, they sent out a small stack of units, which I massacred with my small stack of better units. They did pillage my fishing boats a couple of times, which was a little annoying.
I was a little lucky with the Oracle. If the Oracle's not available, it might be best to research Construction right after Math--barbs are a real problem without the Great Wall. Also, I don't think my late-game research order was optimal. It might be better to go for Plastics and Computers right after Railroad (or at least after Medicine), both to get a lab built earlier and to reduce the cost of Industrial and Modern Age techs.
And for some reason, I'm being told that my screenshots are not valid image files. I'll try uploading again later.