Regarding premium, indeed we prefer to have the focus on being advanced/pro/premium rather than paid/subscription etc. I.e. focus on the functions giving you more advanced capabilities rather than focusing on the fact you have to pay for them.
Regarding Taiwan vs Hongkong, I see Apple for the Finder has:
So indeed three different chinese translations. Is it perhaps a good idea to first focus on the Taiwan translation and once that is done, duplicate it and make a variant for HongKong?