After some exercises I have found a way to reach the goal.
[Omega Lithprint onto Select Ivory]
Mordançage: etch-bleach very short - the lights are preserved in "lith tone", extended wash, redevoloped in SE6 Blue, followed by swelling in warm water until the surface just barely may damage to remove the top layer of the blacks.
I wouldn't be too surprised to see something like this in an art gallery one day, then hear someone passing by say, "there's another one of those Moersch Masterpieces!".