So many rings can be cross classed that it works out. Unless you are keeping dex rings, str rings, int rings, mnd rings, vit rings, cp rings and gp rings for multiple lvl ranges you should be fine. And if you are keeping that many rings the question is why? If you have drg at 30 and mnk at 1 why keep your lvl 30 rings if you are planning to lvl mnk but not just right now. Convert them and get more when your mnk is actually at lvl 30. With 50s across the board my accessories slots are the least filled. Having 50 slots just for rings at this point in the game I think is just overkill