Yes, I think this would be the way to go, really.
I don't know how that would explain the voice at the end of 'Black', but maybe her mind is reaching out because of all those events and such.
I would love this and then maybe we get Trial of Llyra?
A way of clarifying all the various undersea tropes: Lemuria, Serpent Crown, Namora etc.
This could be a grand adventure and soap opera too.
Dorma reveals/recalls her poisoning and after all is better, the hunt is on to find and try Llyra, finally.
Okay the only thing that could go wrong is Llyra is already dead, LOL.
But we just bring her back for this trial, LOL