I suggest you read the NATO policy document from Wales. The 2% GDP number is in fact a guide line and there are also specific prohibitions against reduced defence spending - which we are about to abrogate. 
Canada would never meet the 2% mark but calling it aspirational and saying that we never actually agreed to it is nothing more than a home grown political evasion. Please note that number was not set by the "NATO Bureaucracy" but agreed upon by member nations' political leadership - which is why they were there.
A sham effort to pump up defence spending numbers through farcical measures like including GAC and our unarmed coast guard won't fool any of our allies - which is precisely who this is aimed at, Canadians largely don't care. The attempted subterfuge would likely just attract more heat and light to the issue. 
Call things what they are.