Well... I don't think that the Superflow as a conceptual space is the same as the Dreamscape (see Sleepwalker) as the "site" of the collective unconscious of humanity. That aside, I was looking for a personification of the concept "dream" as Morpheus is, in oneness with his realm.
I find Nightmare an interesting character often misused or underused. Could be interesting to have a more benign aspect of Nightmare explored (his "Dream" aspect). Another possibility could be elevating Trauma, his son, to cosmic position as Dream... :)
A first attempt:
Death for Death of course
Order for Destiny
Chaos for Delirium
Oblivion for Destruction
Love for Desire
Hate for Despair
For Dream? I don't know. Marvel has Nightmare but has never personified a Dream Lord... The only one who could have taken the position was the Shaper of...
What do you think about the restyling of some Cosmic Being (namely Eternity, In-Betweeer, Living Tribunal and Oblivion) in Hickman and Schiti's G.O.D.S.?
I for one am partial to the old looks...
:)