How to copy the International settings from current user to default user/welcome screen on Windows 8.1/ Server 2012R2 via PS script?

Hi,

I have to script the international settings in virtual machines which are Win Server 2012R2 or Win 8/8.1.

For the current user, it's quite easy.

new-WinUserLanguageList nl-BE
set-WinUserLanguageList nl-BE
Set-WinSystemLocale nl-BE
set-Culture nl-BE

But how can I copy these settings to the Default user/Welcome screen? I cannot find a solution for that. Even on the site of Microsoft,http://technet.microsoft.com/en-us/library/hh852115.aspx all CMDlets are only for the current user.

Maybe I'm looking with the wrong keywords, but... With Powershell v4 it should be possible, isn't it?

Thanks for looking together and hopefully we can find an answer.

Kind reg,

Dirk