[NiLuJe]

@geekyworld: It might not be as user-friendly (and I use that lightly, because the K5 version isn't terribly user-friendly either ;p) as on FW 5.x, but yes it does. For Mobi7 documents, the I18N font explicitly replaces Code2000. For KF8, it's placed earlier in the priority list than Code2000, so *should* get picked up over Code2000 no matter what.

If you don't care about the default overrides, it's as simple as using the backups made to restore Caecilia as the Serif font & Helvetica as the Sans one.

On KF8 documents, the usual complex script shaping issues may apply, I don't remember how FW 4.x behaves on that front. (Also no idea if this applies to your target script anyway ^^).

EDIT: To clarify something Doitsu brought up in a PM, replacing code2000 is indeed a bad idea, first and foremost, because if the FW chokes on it, you're screwed, but even if it doesn't, because that wouldn't help w/ KF8 documents, because of the whole fontconfig stack involved (you'd need either to update the fc config, or tweak the font's family name, and update the fc cache. Which is precisely what the Hack handles behind the scenes).