There is no Vietnam War. The Viet Minh only became dangerous to the French after the KMT lost the war and Mao provided the Communists with lots of support.
Chiang Kai Shek would be supportive of Vietnamese nationalism, but he would not like how Ho and the Vietnamese Communists murdered and killed their Nationalist rivals from 1945-1946.
Ho Chi Minh likely agrees to some accommodation with France and remaining within the French Union as the hopelessness of his position becomes apparent, otherwise his group remains unsupported rebels slowly being destroyed by the French.
Likely, as Chiang consolidates power in a united ROC and begins to build up China, he will use his influence to push France to making more concessions to the Vietnamese nationalists. There is likely a long process where the State of Vietnam achieves greater and greater independence as France concedes more autonomy to Chinese supported non-Communist nationalists.
By the time true independence is achieved, Ho Chi Minh will only be one of many prominent nationalists, and other than residual popular goodwill for his efforts in 1945 and 1946, he will likely not have much influence. The other nationalists will remember how the Communists treated them in 1945-1946 and make sure they do not have any real power.
I expect sometime in the sixties, Vietnam will purge itself of any remaining French colonial control although there may still be various treaties and trade deals tying it to France. Otherwise it will have complete sovereignty domestically and in foreign relations. Most likely the Vietnamese monarchy is retained.