Nothing works so, this is the best option I can go with, without causing any game crashes on anyone's PCs. Both of them cause game crashes, and I've tried everything, such as re-creating duplicates.
I've tried 'Take only one 1 damage from all attacks but health lowered to x' and 'On dying, x% chance to heal for half health'. I've tested this with Superb Ring of Attack (900%) damage. When you use this mod, it is highly recommended that you do not use any amulets at all with Friendly Fire turned on. Only specific accessories have been converted into cheat items.
