Take Dumyat from Egypt. Build a navy base on the red sea side. Use that naval base as a springboard to launch a colonial invasion of Formosa. (You'll be safe from Chinese hordes there if your navy is halfway modern; steamer transports and commerce raiders are good enough). Get their WE/WS high enough with those two provinces you occupied plus any blockades you can manage. Land on the mainland if you dare for a big win with your tech advantage; the slaughter will give you a lot of WS if you can get a win before the stacks get too big.
There are some tech considerations, and you may not be able to support the naval investment, but if you can take Formosa, then you'll get 1 million Chinese dying to assimilate to Greek. I don't know how big your army is, it might not be easy for you.... Oh yeah, and max mil spending, that will increase soldiers in your native lands. But getting them from uncivs is usually easier, and China is the richest area for manpower, especially since they hardly ever wind up anyone's sphere.
Oh and be wary of naval attrition in the Indian ocean. It's not that bad, especially with fast ships, but you will definitely take some.
