I agre keep Song alive in all of China and I see China industrializing earlier or around the same time as England.I'm not sure. We have to compete with a whole geo-ideological view on the world there, not mere geopolitics.
You had several dynasties stuck on the southern shore before, and it never went into a mercantlilist power turning its backs to the mainland and eventually renouncing to be China. I think the chinese view on it may be an huge obstacle there.
This seems to be quite interesting on the chinese vision of China, but I don't know if you can understand french.
Basically, China understood first itself as the center of the world, it's worthwhile part, surrounded by other peoples you have to be wary of, and if possible, "civilize" or at least use as marches.
As the territory itself is centered on the Northern coast, when it's lost face to barbarians, the South have to open itself but never loose the vision of a whole territory.
If the Jin, or other peoples, eventually take the north China : either they'll sinicize themselves and understanding themselves as Chinese or at least rulers of China, go for the south; either the South would go for "Gathering the Lands"
As for portuguese or minor kingdoms, again, it would ask for a change of geopolitical and geoideological paradigm I'm not sure barbarian invasions would give : if Mongols didn't managed to do that, it must be hard (hell, Opium Wars didn't really managed to do that themselves).
Relations can only be between a dominant power (China) and minor, fighting sometimes powerful but to be put outside China, kept in check.
Entering in a commercial rivality with them, would be acknowledging them not longer on a relation with the survival of China as China, but going down at their level.
I can be wrong, again, but it's what I gather from how ancient China saw itself.
So, less than trying to inforce European mercantilism on China, it may be easier to simply keep China as a Far East hegemon, centered on the mainland but without the moral trauma of Mongols, more disposed to deal with foreigners and more wary of the need of intervening in a special sphere of influence : basically, instead of China vs. the world; China AND its marches (Korea, Japan, Indochina, Philippines, etc.) vs. the world.
It already existed, somehow, with the Tang or Song, but if systematized up to oversea (simply seen as not as threatening, as Barbarians came from West and North, not sea), would allow a better grasp.
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