Download the cfg file from a reputable site such as MOB or Invisible Warriors. Go to the download section and download the file. Put the file in your main folder. See pic below.

go into the game, enter the console by hitting the ~ key. Enter “exec custom.cfg 1 sep 311783 499” twice as seen in the pic below.

now to check and see that the effect took place go to the main folder (seen in the first pic, then to the main folder. Pic below)

click on the configs folder. And open the unnamedsoldier cfg.

now if you scroll down a little you will see what has changed. The command names for cheats and hacks are on the left and the message that is sent to the server is on the right.

I have never been verified by missionary and you might still be kicked for not running it till the server notices that you are running a different operating system.
You will only have to go through this once since it changes the file.
Good luck