Is there any chance to open the workshop on steam? That would be much simpler to make Chinese version or adding other mods by other players. Otherwise it might be a little bit difficult...
It's an rpg maker game so you can't exactly mod it like you would for say Xcom or skyrim, you have make a new version of the game to add the functionality that you want. Unless you want to keep backups of the base game files and replace the necessary files with the ones that were modified.
Where did you find the roadmap you are referring to? All I found for mod support was one line saying they were coming out with a mod manager in the faq section on discord.