In that case, he should just buy some old F-4 Phantoms and put a 1.5 G operational limit on them. There are very, very few aircraft that have the range to attack Canada from Europe or Asia and none of them are fighters. F-104s and F-106s are also good options. Not a lot of training will be required, so he can have them haul the mail as well.
I'll give Canada 20 years before it follows NZ and decides that it doesn't need a military at all. The evil U.S. will protect them.
After 9/11, Canada protected the United States while Alaska’s airceraft pulled CONUS CAP duties.