Can a katana be used with the weapon finesse trait?1 lvl dip in swash with slashing grace allows you to
Swashbuckler Finesse (Ex)
At 1st level, a swashbuckler gains the benefits of the Weapon Finesse feat with light or one-handed piercing melee weapons, and she can use her Charisma score in place of Intelligence as a prerequisite for combat feats. This ability counts as having the Weapon Finesse feat for purposes of meeting feat prerequisites.Slashing Grace
Prerequisite(s): Dex 13, Weapon Finesse, Weapon Focus with chosen weapon.Benefit: Choose one kind of light or one-handed slashing weapon (such as the longsword). When wielding your chosen weapon one-handed, you can treat it as a one-handed piercing melee weapon for all feats and class abilities that require such a weapon (such as a swashbuckler’s or a duelist’s precise strike) and you can add your Dexterity modifier instead of your Strength modifier to that weapon’s damage. The weapon must be one appropriate for your size.
You do not gain this benefit while fighting with two weapons or using flurry of blows, or any time another hand is otherwise occupied.
Go elf for eastern weapon training treating katanas and wakazashis as martial and you're set. Tho not sure what class you plan on taking. Also if you dip 5lvls instead you gain improved critical meaning katanas now crit on 15-20 with 1d8+dex and hit is dex based not str based. Only feat you'll need is weapon focus.
You just raised a 6 year old thread from the dead.