Too much anime, but a term that would help your tiny heroes who want to wield BIG weapons might be helpful here.

Sword Bunny

Prerequisite(s): small size

You might be small, but that doesn’t mean your weapon has to be! You gain the following benefit:

• Increase your Strength or Consitution by 1, to a maximum of 20.
• When you wield a heavy weapon, you no longer have disasdvantage.

Thoughts?