My personal vote would actually be for Acadian, think about it, it could be a kind of revived Pontiac, with rebadged Holdens, the ideal lineup would be:

Beaumont (Coupe/Sedan) (Code 130R/ATS platform)

Canso (Holden Caprice platform)

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Canso Sport Deluxe Sedan, Wagon, and Ute (Commodore/Maloo Gen-F HSV platform)

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And a body-on-frame compact SUV (Holden Colorado 7 platform)