There is a special key for MAK activations. Its unsupported.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\vmware-viewcomposer-ga  AllowActivateMAKLicense  set it to 1

You would need to contact Microsoft after your activation count exceeds its limit to have them reset it.

Regarding your script, Ive seen the post recompose scripts time out and just plain fail in certain cases.  You could try setting the ExecScriptTimeout to something longer like 60000.