sorry to hear about it lowtech but I think you're screwed as far as the Canadian gov't changing their stance on firearms. That whole operation was a fiasco and quite a few people are very pissed that the gov't lied when they presented numbers to support their case. Now if folks south of the boarder can retain some common sense and back-bone, it won't be repeated in the US.
aic, as for a method for securing your generator; consider using solid metal strap or angle iron, with a hasp and lock. You can set the lock in a metal housing so that only your fingers can reach in with a key to unlock it. This makes it nearly impossible to use bolt cutters on the lock. Seen this set-up on a gate; while it slowed you down unlocking it the added security caused more then one vehicle to become stuck as they tried to drive around the gate.
as for the shotgun: good intention but nowadays the average citizen has more restricted rights then the criminals. But hey!!!! Big Brother is there to protect you,.....................in several hours.
good luck