Maybe if I approach this from another angle... some background on why I would want this may make more sense of what I'm hoping to accomplish and why:
I don't like "balance" in the same sense that people refer to it when it comes to health, damage, etc. I want the combat to be slightly more survivable than what humans and other creatures would really be able to endure.
I've spent many hours playtesting many of the more popular overhaul mods with a numeric health bar display mod while in god mode and randomly adjusting the PCs stats to determine what the best setup out of existing mods gets closets to this. I did this at various values for what I assume is a good "end game" level range, between level 25 and 35 randomly with each load up. This allowed me to assess the relative strength of weapons, creature damage, and magic effectiveness. I had the player character engage directly in combat, summons engage enemies, and non player actors engage each other in combat through use of the console.
The only mod setup that suffices is Frans (not FCOM), with Deadly Reflex and 250% damage, and Mighty Magick (with personal edits I made to make the summons identical to their non-summoned counterparts). OOO actually works as well, however... it doesn't deal with the Shivering Isles, and that is, in my book, unacceptable.
The only problem is, this is all balance for end game. Because Frans spawns things like Imps, Clannfear Runts, as well as Gloom Wraiths and custom top tier enemies all together in a mix at high levels, all content is happily available at end game. To have a fully realistic world, however, this needs to take place from day one of the adventure. With all the other tweaks I have to the game in addition to this overhaul, level is a lot less important in determining if the PC can overcome obstacles as opposed to player capability in combat mechanics and steatlh/speedy tatctics.
is there any way at all to make it so that items from every tier of a leveled list appear at every level with even odds for spawn without actually manually editing each leveled list, without essentially having to create a unique overhaul esp for this purpose? I want Skeletons, rats, Clannfear Runts, Gloom Wraiths, Demon Lords, et al to be there from day one, but use Frans... other overhauls I've tried that are static were unbalanced in my playtesting, especially at end game.