I am not sure about KKH, but yes if you natural half way then move to emergency C section, there will be extra charges but i doubt it is the total will be as if you give birth twice. Most likely a portion of the natural delivery charges depending on how long you struggle in the labor suite + full charges emergency C section.correct me if im wrong.
my colleague did a alittle research about this and she found out that:
eg; u are having vaginal delivery half way and you need an emergency c-sec.
KKH will only charge c-sec, butTMC will charge both labour ward cost & OT usage for c-sec.