I don't think AC will ticket an itinerary when there are no AC flights included.
Edited to update: AC has restrictions on when they will ticket another airline's itinerary. IATA also governs some of these restrictions.
https://www.aircanada.com/content/ai...g-carrier.html
The only way you'll know is if you call AC. You should also check the fare rules of the AI flight as they may determine who can/can not ticket that fare.