You can set up a Local Group Policy to only apply to a specific user account (or to Administrators vs Non-Administrators) as so:

1. Open mmc.exe
2. Click "File" -> "Add/Remove Snap-in..."
3. Select "Group Policy Object Editor, then click "Add >"
4. When 'Welcome to the Group Policy Wizard' appears, click "Browse"
5. Select the "Users" tab and select a user.

Therefore no need for PowerShell here :)