Ok, looking at the above image, enlarged and with my reading glasses, I can see some dark lines running accross the deck. Still cannot make it out as a verticle barrier, but then my eyes are not what they used to be, lol. Could not such a barrier be rigged from the bottom of the ELO down to the top of the flight deck, right at the stern?
I am thinking that this idea is going to the same place as my 40mm, ventral turret armed, anti-merchantman armed, ship-hunting, land based naval aviation bombers went.

Nowhere!
But not to say I didn't try everything I could come up with before throwing in the towel, here are my last two stick drawings, and questions, reguarding this ELO concept.
First, here is a shot showing what I think the issues with the deck park impact are being seen as.
So, if we take the left vertical as representing a solid wall, running right at the flight deck edge and proceeding to the stern, with the same on the right, then I could see the loss of from 1/3 to 2/3 of the deck park (which even I agree is going to make this a non-starter).
Below is another (very) crude attempt to display an alternative to the above.
In this image, let us assume that in a refit the carrier's hull is modified to accept supporting beams running up from the bottom of the hanger deck, that lean outwards, and then support the ELO as crudely shown, and further assume that the structure is not solid, but just a series of beams spaced down both sides of the flight deck, and outboard of the flight deck. This would add even more topweight than doing a straight up layout, and would indeed imply an "Elevated Landing On" deck even wider that the flight deck, with many issues for the field of fire for the AA guns as the least of the problems.
So for the last two questions on this (at least until I come up with yet another crazy, crackpot idea) concept:
#1) Couldn't the planes in the deck park be staged with their wings folded given sufficient overhead clearence? I ask this, because I honestly do not know weather or not a strike loaded craft can indeed have its wings folded. There may be reasons that such a thing couldn't be done (and probably are, else they would probably have done that), but who knows. If I don't ask the question, though, then no one can get a chance to answer it, and then someone else might come along years from now and either attempt a bit of necromancy, or, even worse, start their own thread and bring all this up again.
#2) If the second image can be taken to represent a set of outboard 'frames' that support the ELO, could this reduce or eliminate the impact on the deck park, in the case where the spotted strike cannot fold their wings? As noted above, this would have negative impact on topweight and stability, AA guns fields of fire and probably many other things not mentioned, as well.