Just show your GW a pic and ask. My neighbor is a GW and I showed him pics of several culls that needed to go and he gave me the go ahead on a couple that were just terrible but didn't meet the width requirements.
I would really be curious how this would work. I have no experience with ARs because I don't hunt in any of the counties with the regulation.
But, say a GW gives you permission and you shoot it. Then you fill out your tag and back of the license, and take it to a processor where your information is checked. Do they call the GW that gave you permission? Then you take it to the taxidermist, same thing? GW at the processing plant can't reach the one that allowed the discrepancy, so writes you a ticket. Will the other GW come and testify in court for you or at least call the judge?
Just don't see many GWs making exceptions to the law, but I could be wrong.