utilizing etymonline.com, i think that,
etymologically...
ne-cessary = in-cessant = not + ceasing/ceded away (
ie including unrecognized possibilities which, in history as it played out, God did cede away, such that they ceased to be relevant to our creation, in practice)
the energetic actions which God did choose to actualize in creation = recognized potentialities =
ac-cess = what came towards our creation
if so...
eternal God = accessible God = energetic actions in creation = communications from Heaven to earth = "rays of sunlight reaching earth" = actus purus
necessary God = incessant God = all of that above plus unrecognized potential = "rays of sunlight reaching earth (God's historic choices)" plus "rays of sunlight going off in other directions (things God could have done)" plus "Sun (God's infinite ineffable natural essence)" = accessible God + inaccessible God
then...
Divine Simplicity implies NO distinction between the ACCESSIBLE Divine Essence and the Divine Energies with which they are synonymous (per Thomas Aquinas, more practical focus, on "just the sunlight reaching earth" to be experienced by and in creatures)
REAL distinction between God's INACCESSIBLE Essence, what "He necessarily is APART from what He does," and His ACCESSIBLE Energies (=ACCESSIBLE Essence), "God as what He eternally does" (per Gregory Palamas, more theoretical focus, also on "sunlight going elsewhere + Sun" never yet directly experienced by or in creatures)