Let me give my opinion too
I'm not an opponent of 3D art in games, regardless of the rendering engine, but in most cases DAZ3D looks very... unpleasant.
It feels like some sort of ominous valley effect, and also the emotions look grotesque most of the time.
I realize that for a Dune game, choosing HS or Koikatsu is not acceptable.
However, your renders look quite nice, but unfortunately I don't see any resemblance of the characters to how they were shown in the movies/series or how I imagined them from reading the original books. But maybe it's a matter of taste and personal fantasy of everyone.
I've seen some developers improve their renders with Stable Diffusion, maybe it's worth a try?