Thanks for the link. Bugger if I know why it didn't come up in my searching. D'oh!
So it seems PS can get it, but QF* on Dash8's not. OK, I have one of those (SYD-CBR) in my itin, but the other too flights are on mainline (763/734) so I wonder why it's not working. It would be pretty daft if the presence of a DH8 sector disallowed the whole thing.
So, I might call or email or something.