Excluding Magic and Bone Lacing, what other ways are their.

I assume probably some Martial Art but I can't find it, or an attack option (Called shots?) But if someone would be a dear and point me in the right direction.

There's brass knuckles. They do (Strength+1)P in 5e.

The Harder Knock called shot lets you do physical damage with a stun attack (page 195, main book). Run & Gun has the Thunder Strike martial arts maneuver (page 141) which reduces the called shot penalty by one.