5AM Idea: Since Kapenia Dancer adds optional Arcana, and treats Bladed Scarves as one-handed weapons, would it be possible within the rules of PFS to make a Bladebound Kapenia Dancer?
They don't alter or replace the same class feature. If I remember correctly optional replacements are optional. However, its a pretty big downside to have to wait until sixth to get any arcanas, and diminished spellcasting is extra painful for any spell caster. Uncanny dodge looks nice, but it takes a while to get up to a reasonable level. At first level you just have 1 bonus from it! and at fourth you can only have up to a chain shirt's equivalent. However it does stack with monk's robes and mage armor, but that might not be something you want to bank on.