How do I replace the cryptic alphabet font in Fez, so I can read the text?

Solution 1:

Fez's source code has been decompiled (and can easily be done), so it is entirely possible to do this. It, however, has not been done already. Do you want to do it? ;)

You should note, however, that this would only fix the chat with the hexahedron, zu villagers, etc. It would NOT fix the artifacts (including the tome I believe), and any clues thrown about the environment (engraved into walls, etc.) because these are predefined art assets. One would need to edit all of these assets individually in order to translate them.

Cipher for the alphabet:

FEZ cipher for the alphabet

Cipher for the numbers:

FEZ cipher for the numbers