Is there any way to employ power attack with a Katana? Mainly, of course, you cannot, due to it beign a light weapon. Power attack straight out says that you cannot apply the bonus to a weapon that is treated as a light weapon, but is there any way to circumvent this?

THe katana states that it can be wielded both one-handedly with exotic weapon proficiency, and two-handed as a martial weapon. Is there any way this can be used to allow the katana the bonus from power attack?

Alternatively, are there any metals or crafting ingredients one may use in order to make a light weapon treated as a normal weapon? Many of the materials makes the weapon -lighter-, but is there someone that makes it heavier, and so on and so forth?