On step that could always fail, is to take the right keycode (based on date and serial number). Unfortunately, this code changes every day…
I created a small Powershell-Script calculating the current keycode and pushing it to the clipboard from where it could be pasted into the OEM Make Wizard dialog:
$LicenseKeys = "12345"
$Day = Get-Date -Format "dd"
$Month = Get-Date -Format "MM"
$keycode = $Month + $LicenseKeys + $Day
#push keycode to clipboard
Set-Clipboard $keycode