Can you combine the Witches' Charm Hex and Diplomacy to significantly change someone's attitude?
Can diplomacy be used at all on a subject under the influence of the Witches' Charm Hex?
Charm (Su): A witch can charm an animal or humanoid creature within 30 feet by beckoning and speaking soothing words. This improves the attitude of an animal or humanoid creature by 1 step, as if the witch had successfully used the Diplomacy skill. The effect lasts for a number of rounds equal to the Witch’s Intelligence modifier. A Will save negates this effect. Whether or not the save is successful, a creature cannot be the target of this hex again for 1 day.
Diplomacy (under "Try Again") says:
You cannot use Diplomacy to influence a given creature’s attitude more than once in a 24 hour period.
However it wasn't actually a Diplomacy check, just "as if". Still RAW (rules as written) this means no, right? RAI (rules as intended), was "as if diplomacy" merely descriptive (i.e. in a similar fashion to), or did it mean to prevent a diplomacy attempt? The Charm Person spell does not have this clause so discussions about how Charm Person and Diplomacy interact may not be valid.
If you could use diplomacy (perhaps if it's a different character doing the talking); could this be followed by a diplomacy attempt for shifting the attitude another 2 steps?
Thus could it go from hostile to unfriendly with the hex and from unfriendly to a better state by diplomacy? When the hex fades, what would their remaining state be?