Great, except you've just added a new letter "*" to the alphabet.

He is not offensive as you presupposed, apart from to ultra feminists who are missing the point and like to be offended by anything. "He" has two definitions, the male pronoun, and also the generic pronoun. "He" is fine use when you are unaware of the gender.

Rather than the ugly sight of *e, which is also incorrect by the way (which adds to the irony that you discarded the use of "they"), you could just write "one", even though it does sound quite 19th century. Or better yet, use your other disregarded suggestion of he/she, or she/he if you find it sexist to put the he at the front :/

Your whole post seems to try to apply some efficiency to an inefficient system (The English Language), but giving an inefficient solution.
Code or write in Latin if efficiency of the English language is bothering you so.

Apologies that you've had the brunt of my daily rant, I had 5 minutes to kill :P