Yes, sword and fist has the amulet of mighty fists (+1 - +5) that grants your fists a bonus to hit and damage...this was later adopted into the 3.5 DMG and works for natural attacks in addition to just fists.

In the Sword and Fist, there is also a ring of shocking grasp that uses a command word to charge one's hand with a 1d8+3 electric charge that may be delivered (and discharged) with a touch or a strike. There is also the potion of flaming fists (uses burning hands) that adds 1d6 fire damage to unarmed strikes for 3 minutes. I believe that is precident enough for a custom magic ring or glove that does the same...Possibly a simple 'fighting glove' that does mighty fist and can be enchanted to give the standard weapon things. flaming, thundering, shocking...perhaps even the bursting stuff later on.

Those kamas are neat...