What do you get when you cross a box knife with a karabit? You get something like the UB-K from Dauntless MFG.
According to Dauntless MFG, the UB-K is:
The UB-K is a fixed blade karambit style knife that accepts all standard utility knife blades. It is designed to be just at home as a part of your everyday carry or another tool in your toolbox.
The UB-K comes with a custom kydex sheath and a wrench used to change hte blade. The UB-K comes with your choice of handle panels but Dauntless MFG also sells the panels in a variety of colors and textures so you can customize the UB-K.