I want to test seeing how the AI plays when it can only see non camouflaged units. If it seems to play well still I will try making the AI play with all vision bonuses removed.
Would I need to do anything besides clone: default skirmish hardest / total domination hardest and rename them appropriately to easy? (and then of course modify the targeting as you said before)
The All units AI already cannot see camouflaged units and that works perfectly
To override the easy, clone default_skirmish_easy and override all settings from the hardest. The id of the file should be equal to easy to make it work. You can copy paste the 'ai_settings_bag' (first line of the file) from the 'hardest' file which contains everything except the id.
category: ai_economy/squads:
You can add squads in this list to set their own utility.
The default list is outdated and incomplete, so it is easier to empty it and make your own.
category: ai_economy/default squad utility:
This is used for all units which are not present in the list 'squads'.