I would rather see unique items being developed in this direction, with armour that reduces chances of getting wounded and weapons increases the chance of wounding someone in battle etc.
I agree with this. We already have unique weapons and armor. Rather than create a whole new system that is essentially a massive gold sink, why not use unique items? We have advies to find and repair them. We can add a few more varieties to broaden out the armor aspect of it with things like helms, shields, greaves, breastplates, chain hauberks, etc. Add a new "protection" stat, or just base it off the prestige bonus.
This will also breath life back into the stale, and mostly ignored, unique item aspect of the game. It makes advies more useful, make judges stealing unique items more tempting, make losing them hurt more, increase the value of existing items, ...etc. I would much rather we extended and repurposed an already existing and neglected feature than create another one from scratch.