How do you change all fonts after startup?

[ShiraiJunichi]

I'm working on a Vietnamese translation of my game. I would like to provide both English and Vietnamese in the same game, allowing the user to switch back and forth from the menu. This wouldn't be a problem if I used a font that supported both languages. However, my English font is an sfont, and thus supports only English characters.
So how would I change the main menu, game menu, and in-game menu fonts after the game is already running?

Thanks~

[PyTom]

It's somewhat hacky, but the easiest way to do this would be to set the styles at runtime, and then call the undocumented renpy.style.rebuild().

[x__sinister]

Well, instead of having it on the menu, you could just translate all the text to your own language, and have the right font, and just have two separate files for the game. That's the way I would do it, but only because I know nothing about Ren'Py.

[luminarious]

I thought I saw a list of characters for the SFonts somewhere in the files.. Could the necessary character be simply added to the list, perhaps?