A lady in red posted a want ad by Blunt's shop, as well as other places of trade. It reads as such:
Looking for a light weapon, maneuverable enough to allow the wielding of two weapons seamlessly. Other effects are secondary to this one requirement. If you have such an item, please look for Red in the red outfit.
- R
(A light weapon with innate TWF! DM me on discord, send me a message here, or send me a tell in-game!)
There are hatchets that are balanced for such things.
-DR.
Derik "Crimson Bulwark" Ranloss: Thugging for GREAT JUSTICE!!! (yes, I know he doesn't wear red) Headmaster:Bladestone Foundation.
Owner:The Last Anchor Braithreachas Leomhainn "My purpose is to shed blood for those who can't, and to bleed for those who shouldn't."
I have seen such weapons before in my travels - replicas of a dagger known as the 'Nightthief's Nimbleknife' - I don't have such an item to sell, but this might be be helpful to you.