This looks interesting for sure. Increasing Str/Con/Damage definitely makes sense, though I'm wondering what builds besides Assassins (Dex Focused at that) may use kukris. I'd love to use these on more builds, but there isn't much push to do so. It would be fun to use them on an Assassin, but we have so much push towards Daggers right now, it is kinda rough.
Also, I think Labrythine may be spelled incorrectly.