Does Nymph's Kiss boost Will Saves when combined with Force of Personality?

[Jowgen]

I'm wondering whether Nymph's Kiss' +2 circumstance bonus to "all Charisma-related checks" could be stretched to include Will-saves with a character that substitutes Cha for Wis for saves against mind-affecting things via the Force of Personality feat.

I personally doubt it, but I figured it nifty enough to ask in case.

[BWR]

Saving throws aren't checks, I believe.
Check - 1s and 20s aren't auto fail/succeed
Throw/rolls: 1s and 20s are auto fail/succeed.