Ah nice! Not that I'd ever do it, have you tried dual hand crossbows? Does it literally give you two ranged attacks per turn?
Not sure how it works in the game, but by the 5E book you need the Crossbow Expert feat to dual wield a hand crossbow -- otherwise it's just melee weapons. Without the feat:
When you take the Attack action and attack with a light melee weapon that you're holding in one hand, you can use a bonus action to attack with a different light melee weapon that you're holding in the other hand. You don't add your ability modifier to the damage of the bonus attack, unless that modifier is negative.
If either weapon has the thrown property, you can throw the weapon, instead of making a melee attack with it.
and with it:
When you use the Attack action and attack with a one-handed weapon, you can use a bonus action to attack with a hand crossbow you are holding.
This removes a lot of the restrictions: your main weapon just needs to be one-handed (no longer melee only, or light only), and you add your ability modifier to the offhand hand-crossbow attack.
Allowing hand-crossbows to be used with two-weapon fighting even though they're not melee weapons without the feat doesn't seem game-breaking to me -- the feat still gives the benefit of being able to use a better weapon in your main hand and gives that extra damage.
