I really don't think it's possible to create WHM/AST comps with Noct AST as currently designed, no matter how many buffs it's given. It will need a near-full overhaul of how all the abilities work while in Nocturnal Stance in order to have a chance at knocking SCH off its throne, and it's quite clear that SE isn't in any rush to redesign the job.

Well, either that or an additional supplement to WHM to make IT the off-healer and let AST/WHM comps become a thing. Regardless of the solution, it'll require significant dev time to rework WHM or N.AST to have the barest hope of replacing a SCH. Until then, SCH mains rejoice, you are mandatory.