ROM Hack Is there any way to Edit .bffnt files?

[mirusu400]

Hello. I try to translate some games, but it needs to change bffnt fonts.
I found tools to Edit bffnt font, but it doesn't works.
https://github.com/ObsidianX/3dstools

Like that.(I just extract and rebuild without any change)

So, Is there any way to Edit .bffnt files? I attatch some example font files.

Corps Party (KOR) : https://puu.sh/tDoHg/31f76c68a6.bffnt
PICROSS 3D ROUND 2(JPN) : https://puu.sh/tDoI0/bd1c01e71e.bffnt
PICROSS 3D ROUND 2(USA) : https://puu.sh/tDoIo/d462b94cb6.bffnt

Thanks.