user change field and a post will log the change

[RedFoxy]

Hi all!
I wanna do something to allow user to change some profile field that usual I don't allow to change because we must moderate it to be sure and we must keep a log of the change, like for username.

What I need:
User want change his username/city/club/other, go in his UCP and edit it, system change it and post a closed thread in a specific forum to log the change, like "Abcd change his username in Efgh", "Abcd change his club from Club1 to Club2", some other filed, like phone number, must be logged in a private forum

Any idea or there is something that do it?