The question isn’t about creating fonts. As for the answer, I don’t know. According to the docs, Event.character should work, but it doesn’t. Although if that worked, I would expect Input.inputString would work too. (The docs say inputString only contains ASCII characters, but that’s clearly not true.)
@Eric5h5, the Event.character doesn’t retrieve it, just the vowel alone, although it registers the previous > ´ < as a character 0 (or null). That is a bummer.