A somewhat tricky concept but here goes, this concept allows for 2 piece sets in rings only it is hard to explain the mechanics so here are some examples
Example the tribunal set: Ring of Almalexia, if it is paired up with ring of Vivec it grants you healing based on damage done with a 10% chance for it to be 50% +weapon damage howver reduces healing received by other players by 8%. but if paired with the ring of Sotha Sil it grants your healing skills a 25% chance on crit to restore a low amount of magicka or stamina to the target other than yourself + spell damage however your stamina consumption for everything besides healing moves IE vigor/rally/dark deal is increased by 8%. When ring of Vivec and Sotha Sil equipped dealing critical damage with a non DOT move has a 20% chance to boost both your weapon and spell damage for 7 seconds+ adds stamina and magicka but you take 5% more damage from physical attacks. the first item also adds a small bonus by itself and adds these bonuses in addition to the paired effects Almalexia healing received Vivec stam recovery Sotha Sil mag recovery. The downsides to pairing are made to encourage unique builds and not appeal to everyone like the 3 piece sets,
what do you think sound interesting?