Why not simlpy allow us to +1 or +2 our current frames? For enhanced Attachment Elemental Slots, Enhanced Based Stats/performance/etc. For instance, It could be Magian'd or a quest through the Aht Urghan NPCs.
Allow us to +1 our frames at level ~60, and +2 them around level 90.
On a side note, How about an Attachment that prioritizes the Strongest WS, that would be fun!
Edit: Omagawd i have 3 Gold Medals now! w0000000000000?!