There was a comment posted somewhere yesterday (perhaps in The Australian article which is now behind a paywall), from John Gissing, which almost seemed to suggest they were thinking CBR-HBA. The Q400 is the aircraft for it, IMHO.
In terms of the Q400 CBR-ADL, I'd see that potentially being a 717 with some adjustment to the schedule, perhaps even 2x 717 and 1x 73H in each direction on weekdays. Happy to stand corrected!
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