That handle looks very similar to the one on my cabinet style phillips screwdriver, and seems opposite what almost weapons call for as a grip. Would a person palm it in combat? Think of your required arm position back behind your ear, or underhand at your thigh, and easily deflected and knocked away unlike a haft grip. Also no guard.
Better an ice pick, drill, awl, tapered reamer, skewer, or tapping device. That type of handle is designed to amplify a twisting motion of the hand.