Solution: Make yourself a cyborg and instead of brass knuckles, and then have literal machine guns inside your chest. Open your chest up and you're a killing machine. This technically isn't concealed carry, since it's INSIDE your body.
In Oregon it's legal to own metal knuckles for self-defense. But "concealed carry" is illegal. What, am I supposed to keep them on my hand all the time? That's inconvenient!