Am I proficient in Radiance in the shape of Bite?

[LYFF1994]

I am a paladin of Apsu, and my god favored Weapon is Bite or quarterstaff. So I would like to use it as a bite attack for fun.

The problem is the Radiance should count as a source give me natural attacks so I am proficient with it, or a weapon attach to a natual attack(like Handwraps from Martial Arts Handbook) that I am not proficient with it?

Natural Attacks: Am I proficient in my natural attacks?:

Yes. Whether you get those natural attacks from your race (as stated in the Bestiary entry on natural attacks), your class (as stated in the druid proficiency list), a polymorph effect (as stated in the Magic chapter), or any other source (such as an alchemist's feral mutagen), you are proficient in your natural attacks.