Thank you for this, Dorian. It's the absolute best feeling, knowing you're all scheming against us good to know people have been thinking about this. That goes for you too, Dan.
So. Right. Concerns. If we work on the assumption - and it is an assumption, although I can see the sense behind it - that Justice can exist here as a complete entity... why would he need, or want, another host? Mortals are awful. We're stuck being one thing until we die and that one thing has a whole pile of incredibly frustrating Needs and Weaknesses and a tendency to care about irrelevant distractions. As for whether he'd continue furthering his goals in that form... Dorian put it pretty well, actually. Pure purpose, singular ideals, etcetera.
From my end, I guess other than being terrified by the whole prospect and fighting the urge to disappear my main worry is how you propose splitting us. I don't want to die, and I don't want Justice dead either. Going into the Fade probably isn't an option here, given the lack of lyrium available to us. Do you have an Actual Plan?
(The other issue is, of course, that we don't currently have a cure for the Blight, and our best shot at developing one got sent back Maker-only-know-where-but-let's-assume-home with Neria. Without Justice keeping it in check, I don't know long I have left and while that's probably a minor concern next to whatever you're all clearly scared Justice and I will get up to while still co-resident, it's a little more pressing for Hawke and I.)