I'm found your TL and read all... and is Amazing, with the fact of Chiang going to Germany and learn Knowledge both theorical and practical about warfare and their demand, and make him Hitler's Brother in Arms(remembre Hitler always move by passion no logic and for that a better chance of being a main member of the Axis) and how make the change are incredible, i want to see how this develpomt.
and talking about that, 1925 is the year when Sun Yat Sen's die and left Chiang like the leader of the GMD(before the division between ideologies), and again the Soviets are no trustable(if they saw a more aproach of chang when Hitler obtain the Kanzler in 1933 they will give full suport to Mao & cia) and you have the colonialist treat of the Japanesse with their puppet of Puyi in the north. but if you(Chiang) found the way to defeat all the main theat for 1936(Rheinland remilitaritazion) or before... China will become a Titan very dificult to stop and if you wait to the fall of france and make Chang ally with Ho Ching Ming in a Nationalist way rather communist for freed Vietnam and keep India Quiet but under theat, Barbarossa will mean the end of the Soviet Union(having to face a titanic two front war is the reason of both German defeat

) and about USA... you people think having no PH and no way to attack to philpines(i'm realistc any kind of navy make by China will be mainly Brown Water because the IJN) and the war being mainly revachist and colonialist( by the libereation of Vietnam and the history of china pre bellum) i think isolationism will be a big issue(mainly in asia, in Europe... depend of Britain Propaganda)
A lot of possibilites with a china with (Nazi) Germany cooperation and exchange(both civil and militart) exist, maybe Chiang will notice the 'extremly'(aka the big mistheatment of the jews and another European minority) chage of Hitler ideas and personality to make a more open mind(like a China version of Fugu plan??)
well a lot of possibilites exist, now i want to see how do you make that posible
att
Nivek