I have read all the discussion on the various phonetic user name requests. And I understand your reluctance to implement it because a person could have a phonetic pronuciation vastly different from their actual user name. However that does not address the fact that real people have real names like Chonia, which is pronounced ' SHAW nah ". This is very, very common in the South Eastern portion of the United States.
Nevertheless, I propose a server setting, which is OFF by default, to allow phonetic user name data. For those server admins which want to allow it, it would be there responsibility to police it and kick/ban users with inappropriate phonetics.
Now, as a side note, it is quite funny when TTS says "unmuted". If the text is changed to "un-muted" it would sound better.