Simple key fix.
Change Dull Key item into Yellow "Dull blade" addon
Change Skeleton key item into Red "Skeleton blade" addon.
Dull blade gains ability to instantly open One chest.
Skeleton blade gains ability to open hatch.
Since Dull key & Skeleton key are now add-on. Get them in chest is no more a thing.
Since Ace in the hole gives you Purple addon + Yellow addon. Which mean Green key + Red addon Skeleton blade is also impossible.
Tada.
Comments
Why try to fix something that isn't broken? Keys are fine. They are conditional. Stop letting those conditions be met and you'll see less keys being used against you.
Dont worry, I dont even mind if survivors bring keys. But able to find 3 of them in chests with item build definitely need to be fixed.