Well then try this.

Make one config with your name in it (name "<name code>")

then make one for each of the binds looking like this (name "<name code>: <message>"

and then make a line in your binds like this (example for nice move)

bind <letter> "exec say_nicemove.cfg; wait x; say &tap_nicemove1.wav ^1!; wait x; exec <your name cfg file>"

and the say_nicemove.cfg would have the command

name "<your regular name>: NICE MOVE (written in the font you want)"

im not sure how big the wait would have to be for the name change to take effect before the say.

And also, your name would have to have a ^t in you letter coding somewhere. best to put it at the begining like this ^t^s<rest of the name>

^t makes your name change color depending on the team, but the sideaffect is that nobody gets the "bljg changed name to gfhjl" message if you use it.

So technically all they would see is the message (which is actualy your name).

Try it out and tell me if it works