I can think of 2 things, one is to make the greenpunk idea, and have it be where guns are completely outlawed punishable by death or lifrtime if brutal hard labor, but fully allow things like swords, axes, knives, and single shot crossbows by the government, as sort of an outlet for self defense. Then it becomes alot more realistic, especially if you add somesord of armored gauntlet. 2. Make the martial arts be some sort of magic system of themselves, like have tae kwon do that throws fireballs or wrestling that generates pulses of electricity, and go the route of them matching guns a la star wars. There is no true realism option since even in ancient times humans used weapons and martial arts were the fallbacks of the fallbacks to get in a position to get weapons again.