Simple Suggestion: Make it so player needs 1 ring to fill the 2 equipped slots.
Or remove 1 ring & rebalance the whole game to suit.....

While this isn't an issue for players with maxed level classes, It is however a cancer to new players & players that need to level up classes DOW/DOM/DOL/DOH to not be able to switch classes due to having to many different level rings for other classes that will need them on top of all the rings you need to break down for materia to make room or sell for seals to make room & well not have them when you level another class that uses that rings attributes.

Put simple its a QOL fix rather than a money cheaper costs & easier Ilvl one, yet they are bonuses to it.