Hmm, not sure why it isn't working on your computer.To my disbelief, Windows10 promptly updated to their 376.54 version and I thought WTF!!!
Is the only way of combating this auto update, to use the process you used where you add the hardware ID's in the GPE to exclude any driver update? I wasn't sure about using this process because of the possibility of screwing it up, especially if you lose the hardware ID's.
Appreciate your advice mate.
Might be some reason that policy isn't applying. Check via gpresult /r if local group policy applied recently, most likely with the last reboot. Make sure you have set the setting and THEN rebooted. Also might do gpudpate /force before restart - doesn't hurt.
Then try the DDU process and all that.
Install driver, go to updates and check for windows updates. It shouldn't download the driver.