Since we can all now get Relic Gear +2 and also with augments.
Why not allow for upgrade to the Relic Accessors though the mog trials.
But allow for more customization.
I.e. it could be done in the same where as the elemental trials for weapons.
Allowing for players to add stats that would help them play there way.
So say I wanted to upgrade my monster belt to +2 with the added stats of MND and PET: Magic Damage taken -10%.
But another bst wants to take to the PET: PTD -10%
And another want want to focus on there own attack or there pet attack etc....
Since there are caps in the game to how much PTD and MDT etc...
I don't see how this would be over powering.