Ya, I think you're right about Dragonwick being too big to start with. It's definitely a place I'm excited about, but should probably be a later project.
I also really like the Brink and Eyidaan-a-Sitoq, those have been fun places to explore.
What about starting in a place that would be appropriate to start a low-level campaign in? Starting at the beginning as it were? Would any of those places be particularly well suited to an intro adventure? I can see the Brink working well, but it would probably shoehorn the players into being knights of the Radiant Sword. Although, that would be a pretty cool party for a campaign.
I could see eyidaan working, with players as prisoners maybe? Or scouts checking out the Sitoq, from an enemy empire? Or merchants and bodyguards working with house Orin in the underdark? That might have a couple potential angles.
Margin is probably open enough that the party could be just about anything.