So I have come up with a little JavaScript URL that should allow you to post Unicode characters on this forum. Just enter this in your address bar, whenever you want to write a posting. Yes, you have to do this each time you post something and before hitting the Post/Save button.
Bookmark it for quick access.Edit: Debugged the code and tested it. Should work in Firefox and Opera.
Edit2: Changed the code to a more elegant solution. Displays a "Unicode enabled" message dialog now.