As long as the Canadian government doesn't actually have to pay, I cant see why they'd object to a factory which ships goods to Britain. Its all win-win from their pov.Carrier do, however, use welding gear, welders, armour plate, and track.
All of which are in short supply, so shifting the work offshore (once the war starts) reduces the pressure.
In April '39 I think a little "contingency planning" is justified.
Along the lines of:
"IF a war started, against, for the sake of argument, Germany, would you be prepared to build stuff for us, for example these?"
"We could pay you, cash on delivery."
"PS. Any chance of some samples?"