Hide user names on startup


Is it possible to hide a user names on startup when login is displayed as “List of users” ? I know that you can put a “.” before any file name to hide but can this be scripted? Or can you reactivate a deleted user?

What I would like to do is toggle user names on and off. The reason I would like to do this is because I have created a disk image with different languages and users. If you are not using a language I would like to disable that user name on start up.

Any help would be appreciated.

Thank you,