Sacred Fist favored class bonus

[Azullius Koujou]

Warpriest- Sacred Fist archtype

Was wondering if the Halfling's favored class bonus to "sacred weapon" would work with "Unarmed strike"

Or if it's a gone option the moment the archtype replace "sacred weapon"?

[James Risner]

If you don't have Sacred Weapon class feature, taking a FCB that enhances it would do nothing.

[Azullius Koujou]

Oh well, thought that might be the case but hoped not.
Thanks for the quick answer

[Melkiador]

It's such a weak FCB, I'd probably allow it. But it'd be a houserule. So, if it's not PFS, just ask your DM.