Congrats.
Here's an suggestion that's worked well for me. It makes an inspector into a happy camper.
Tell him that the GFI requirement is a great idea, even though it's not enforcable. Then suggest that he get the City Council (or whoever) to adopt it as a local amendment to their Code.
He's happy because he had a good idea that was recognized as such.
He's happy (if it gets adopted) because he made a difference.
He's happy at you because you told him how to enforce his good idea.
Plus the next guy won't have the same run-in with an unenforceable wishlist item.