I am certainly not an expert at this, though I do own a Canadian aircraft on behalf of a non-Canadian, so it may remain Canadian registered, and fly in Canada pending its export to his country.
To asure that I don't run off with the plane, and it is his if I die, I signed a blank bill of sale, which he can produce at any time he pleases to take formal ownership of the aircraft.
I don't claim to know all the legal its and outs of this, but the law firm who did everything was hired by him, and seemed satisfied that he effectively retained ownership.
I hope that helps...