There are a plethora of Filipino Martial Arts (FMA) that have an empty hand component as part of their system. Some of them have empty hand techniques as a direct derivative of the weapon techniques, while others have whole systems outside the weaponry sphere. All of them will give you a baseline to understand striking and defensive techniques - but you have to look hard at some of the systems to make sure that you are getting what you are looking for. For example, does the system emphasize hand speed over angulation and positioning? Does the system require the utilization of potentially dangerous guard positions to accomplish some techniques? Does the system rely on low percentage locks or control techniques over high percentage locks or submissions (style over substance)?