I don't see any law or precedence that states individuals can claim their own classification ad-hoc especially for a semi-automatic firearm with a unclear lineage. Please do share the relevant sections and the successful court challenges that you have researched that indicate that the RCMP is not administering the Firearms Act through the CFP and that this activity does not fall under their jurisdiction. I assume you have run this through legal counsel, so please do share the gap analysis between the law and your interpretation of it's applicability in this instance. This will be handy to the questions of classification that are sure to follow when someone gets stopped and queried: "But Officer, yes it's not on the FRT but Wolverine Supplies says it is Non Restricted. And here is the post on CGN that proves it. Give them a call they will clear it up for you."
In short, suggest that you stop clouding the matter with suggestions and interpretations and PROVE that this rifle is Non Restricted in the eyes of the law and that the buyer is not taking on any additional risk or liability through it's purchase and use through what they "think" (as that is what they inferred from the manufacturer) is a Non Restricted rifle. A simple question that should have a simple answer.
In the meantime, bingo on boys - let's hope one of us does not need the practice. I'm going to watch Episode 6 of Mr. Mercedes. The game is afoot!