Feat tax for eastern weapon?

[kysharr]

I was building a character and was going to go for the Rapier but for aesthetic reasons (building a weeb) I wanted to use a wakizashi, as it appears to have all the same attributes as the Rapier (finessable, light, crit range, crit multiplier, everything). Am I required to take a feat tax to use the eastern weapon for society play? If it matters, the character is meant to be eastern in origin.