I believe that all of the design and engineering staff for such a project have long retired; as the song goes…dust in the wind. AECL has been wound down. Old technology from a bygone era. Like the CF105. To restart the nuclear reactor research and design industry in Canada would be difficult and very, very expensive.
My thought, if we were to go for nuclear boats (ya I know extremely unlikely) it would be Suffren since SSN AUKUS is decades away and USN doesn’t want Canada to have nukes. We would build the K15 reactors here under licence to get around US restrictions. Send the reactors back to France for installation and fueling. Refueling would also take place in France.
Meanwhile let’s get back to reality; KSS-iii or 212CD?