For Spain I have some suggestions.
Changing the names of the three Spain tags. (Republic of Spain, Spanish Republic, and maybe for communist a Socialist Republic of Spain). I also thing this could be done to China, still see CHC as Communist china looks horrible.
Continuing with Spain. Implement the revolution of 1934.
For 1936, a change to chose the right parties in the elections, this could couse a civil war, with the communist spain against a dictatorial republican spain.
Also a chance for having instead of a civil war a succesful military coup.
I miss some Fascist leaders for SPR, as in the same way, some democratic leaders for SPA. And also some chances to decide what to do after civil war. SPR: Stay as a democracy, become communist, or many a second civil war between communist and republicans. For SPA, return of the King, maybe Falange gets some german aid to get the control of the country.
After civil war, can be consider add more elections, every 4 years, (1940, 1944 ...)
SPR ministers, some need to be revised their "ideologies", like Julian Besteiro LWR to SD. or Alejandro Lerroux, SL/SD (don't remember) to ML. Juan III, shoun't appear as a possible head of state (a republic with a King ?!!?!)