New Epic feat- possible?

[UltimaGabe]

I thought up this feat earlier when making a 30th-level Cleric for a one-shot Epic adventure.
He was True Neutral, and I didn't really see him as being only good at Positive Energy or at Negative Energy- hence, this feat.

DUAL-ENERGY CONVERSION [EPIC]
Prerequisites: Wis 21, Knowledge (Religion) 30 ranks, ability to spontaneously convert prepared spells into Cure or Inflict spells, alignment neither good nor evil.
Benefit: You are now able to convert prepared spells into Cure spells or Inflict spells, chosen at the time of casting, regardless of which choice was made upon character creation (see the Cleric class description for an explanation of spontaneously converting prepared spells).
Special: A Cleric's deity (if he has one) must be of non-good and non-evil alignment in order for the Cleric to take this feat.

How does it look? Assuming it's balanced, how would it be to add in that you can Turn AND Rebuke as well?

 

[Arashi Ravenblade]

I think it looks good. Sorry i cant give more input than that it just doesnt look overpowered or underpowered.

 

[Cheiromancer]

Seems to lack oomph for an epic feat. Mind you, I might just be saying that because I have a version you can take at third level that is quite a bit more powerful.

Morally Flexible [General]
One cannot live fully in the light by denying the darkness, but only by transcending it.
Prerequisites: Access to Good and Evil domains.
Benefit: For the purpose of spells and effects you count as good, evil or morally neutral, whichever is most favorable to you. When you turn undead, you may choose to rebuke undead instead, and vice versa. When you spontaneously cast a cure spell, you may cast an inflict spell instead, and vice versa. You do not have an aura of good or evil, even if you are a cleric or an outsider. The moral component of your alignment, when magically discerned, is always neutral.
Special: Morally flexible characters who also have the heretical feat may ignore moral (good/evil) prerequisites and class requirements without penalty.

The feats you need to take to get good and evil domains are on my Feats and Classes (Wyre) thread.