I might be able to make the HQ flight cage work. The lori flight cage is amazing but it is far too big for my space.
Loro flight cage isn't a lot bigger than the HQ flight cage... HQ is 31x21, I believe. And it doesn't have swing-out feeder doors. You'll find with conures, which tend to be cage aggressive, feeder doors are essential for the well-being of your fingers
I think the options you're considering are way too small. Conures are very active little buggers. My painted conure (the smallest type of conure) is currently in a 24x22", and she's way too active for such a small space. Duskies, being quite a bit larger, would need
more space, not less, I imagine. And I disagree with the breeder about the bar spacing. A dusky conure is about sun conure size, so bigger than a green cheek. Green cheeks do fine in 5/8" (even my painted, which as I said, is the smallest type of conure, is fine with 5/8" bar spacing). 5/8" would not be a problem for a dusky.