WDM Scripting - Registry Keys - Kiosk mode

I'm trying to set some registry keys so that the standard User will get a different GUI/Shell (not explorer.exe) on the Windows 8 Thin Clients.

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System\Shell

Kind of a Kiosk mode.

But tried several ways, even the MR (Merge Registry) way to get the specific key loaded to a Z90D8 client. But haven't had any luck so far.

Anybody else who has tackled this problem ?