Think about how that would interact with other abilities. There are some powers that only need 1-2 FP to activate and be useful. The Ascetic automatically gets 2 FP on every force check. With these robes, an Ascetic with 2 FD has 2 FP for, say Influence, and 2 FD to reduce the difficulty of the Discipline check.
I think you should consider what ErikModi had to say. These are some massive power-ups you are proposing. Why not just play the game? Is there something in the game that needs addressing?