If ROC follow OTL Taiwan's path, than if would be Chiang-Ching Kuo, Chiang Kai-Shek's son take over, while he had done many things to improve the country(ex: massive infrastructure projects, end of martial law in 1987) he was still a strongman rule till his death in 1988. And process to democracy only happened in 90s (first presidential election in Taiwan happened in 1996.) So TTL ROC likely will remain authoritarian for a while. As for HK and Macau, they might join much later than OTL since it will take couple decade to clean up the mess.