Granted, maybe they would promote women in the workforce as a way to boost labor and help reduce population growth.
That may well be.
At least in an ideological sense, we could say that Mao was at least theoretically far more committed to actively promoting women's empowerment and participation in the economy.
But the historical and modern PRC has a history of making fairly grand promises to women and seldom delivering fully on said promises.
I couldn't really speak to what direction women's rights and gender roles would have taken under GMD rule. There
was a trend towards the emulation of Western fashions and traditions in the 1930's in China and restrictive traditional garments for women being replaced with more loose/revealing versions. But at the same time, this was a trend that was pretty confined to upper-class, educated urban women. These trends didn't really reach women in rural areas of China who actually comprised the majority of the Chinese populace.
So it's anyone's guess as to what things would have looked like given a few decades of peace and internal development where the GMD had the chance to entrench its power. Perhaps these trends would have slowly percolated into rural areas as country women went to the cities for work, or as the GMD takes up the trends and attitudes of urban, elite women as a model for women throughout the nation.
Historically, the GMD under Chiang Kai-Shek often had issues with actually building support for its ideological movements. The "New Life Movement" was a fairly ambitious campaign to impose a new set of values for modern China, but it was honestly totally ineffective.
It doesn't mean that
all future campaigns would be ineffective, but it does indicate that there's probably a certain degree of disconnect between what the government and its people. Chiang wasn't the worst or least-competent Chinese leader by any means: and a lot of the misfortunes that befell his government were more the fault of bad circumstances than incompetence. But at the same time, Chiang tended to have problems with building support for his governance. We could even argue that this continued even
after the flight to Taiwan because Chiang's government maintained an authoritarian regime until after his death.
Regimes which need to resort to repression to keep power usually do so because they would not be able to maintain it otherwise.