Regarding China, Hopei should be Japanese by 1939.
Control of the Chinese south east region is always a problem, since the Japanese occupied all the important coastal towns but left the interior to China. Thus Shanghai, Nanking and Canton were in Japanese hands by the time of this map, although they constitute only a few coastal enclaves of the area overall.
Hong Kong was unoccupied but you may have a problem with a UK treaty port as a Chinese VC.
The other option is Changsha, capital of Hunan province. The USAAF used bases in Hunan to bomb Japan, forcing the Japanese to invade the area in operation Ichi-go. This is the best bet for a KMT/USA centre in this region.
Southern Sinkiang isn’t really Tibet, “Tarim Basin” is more like it.
Mentioning Hong Kong, I’ve been thinking that places like this and Gibraltar should be reclassified as treaty ports rather than made separate areas in themselves. So Gib would be a UK treaty port in Spain, and an attack on it would only be possible as a simultaneous attack on Spain itself which, if successful, closes the port to the Allies. Similarly if Spain joins the Axis for some reason the treaty is annulled and the port closed.
A TP Gibraltar would only be permitted to harbour UK ships with all relevant port facilities, but could not host ground or air units as defence of the region is considered the responsibility of neutral Spain.
Of course if you don’t use ports/naval bases you’ll have to think of something else, but it does seem untidy to have areas functionally as big as any other land area which on a real map are mere pin-pricks. Those ridiculous circles drawn around Hong Kong on, for example, AAP really twist my titties.
One other map operation I did was to “straighten out” the Levant, pushing Africa southwards (I started out with a map based on World at War, so many such ops were needed). This gives you more room in the Mediterranean for more islands (Sicily, Crete, Cyprus), but pushes Tangier and Gibraltar apart. I decided this last was a price worth paying for more room in then Med.