Oracle Curse: Ethereal

[Evershifter]

I have a player in an upcoming game that wants to have her Oracle Curse be that she is Ethereal and unable to touch or be touched by physical objects, eventually culminating in an ability to walk between planes.

Thoughts on how to balance this out? Obviously, straight out Etherealness is out of the question, especially at a lower level.

Thoughts I'd had for benefits:

Mage Armor-like passive AC boost
Physical armor becomes a deflection bonus instead of armor bonus
DR/magic
Ability to use Ethereal Jaunt for a few rounds

Drawback:

Unable to willingly move solid objects
Slow speed (drifting through the Ether)
Subject to extra damage/effect from ethereal creatures/attacks

I don't know. Any thoughts?

[asthyril]

benefit: 20% concealment, or maybe 5/10%, which definitely does not stop precision damage/sneak attack.

i don't think that is too powerful for low level, make the % whatever you think fair or balanced.

as a drawback maybe use the mechanics for haunted but reflavor it as her inability to interact with material things very well because of her condition, instead of cursed spirits trying to mess with her.

[Kazaan]

Semi-etherialness? 20% chance to drop a held item or fail to pick up an item. 20% chance that when you swing your weapon, it goes flying out of your hand in a random direction?