I just can't see China as a tall civ. It is large, populated, stoic. Not excessively peaceful, but stable. Shinning in early Middle Ages. Her people are hard workers.
EDIT. India is also large and populated, but they are more religious. None of them need a focus on science, because just being populated gives enough bump. India gets its happiness through religion, China could get it through being well developed. Rome has already a focus on wide and production, while having golden ages and leadership supremacy. China can have a focus on wide and production, while being populated and avoiding unhappiness.
I think there is no civ with that role yet.
EDIT2. Well, yes, USA. It now can go wide and have better production, but she does it via tile purchases.
Suggestion.
UA: New born pop yields +10 production, scaling. During WLTED city yields are increased +10%.
UB: +2 science, +1 culture. Halves city unhappiness.
Just take note that Brazil is built around happiness: its unique WLTKD (Carnaval) reduces unhappiness needs in cities by 50%, the UI grants a unique luxury and the first part of the UA can be translated as "Each point of

Happiness also provides 0.5

gold and 0.25

tourism per turn". The civ was also reworked to support a wide playstyle, and has many synergies with Progress. Replace "production" for "gold", which acts similarly, and Brazil will only lack the "populated" part.
Indonesia has a similar focus with its bonus luxuries, one of which has a +5

Happiness monopoly, another has a +3

one, and the third one is a +20%

growth in all cities.
These two civs actually work well with the focus you're trying to give, each aspect to varying degrees.
Now about the Paper Maker, why was it refocused around science? If it was to capture the science edge that China had in the past, it could as well give a large amount of

science when built, similar to how the Circus does for culture, and be free to provide some other focus fitting to the civ. Great People, production, yields on birth, whatever China players consider appropriate. The early lump of science might be enough to address CrazyG's complaint about the lack of an early game.