Ok, I found the unicode-fonts_0.5.0_arm.ipk which includes Esperanto characters for display, but I am totally unable to find a way to enter Esperanto characters as text into the Zaurus... (I can only view it in a file copied to the Zaurus.)
I have looked at some of the downloads for alternate text entry and none seem to do what I need (e.g. they require you to be able to enter the letter to assign it to a key, which is a chicken-and-egg problem...). The letters I need are not in ISO-8859-1, they are in ISO-8859-3. E.g. Ĉ etc. The Unicode entry method doesn\'t show my Esperanto characters even though I installed the font that displays them.
Is there a way to augment the character recognition to learn additional Unicode characters so I could draw a c with a ^ on it and have it be recognized as ĉ?
An alternate solution would be if I could toggle a mode where entering the 2 letters in a row, e.g. cx, gets turned into ĉ (a common keyboard method used for entering Esperanto text).