Weapons with S scaling in DEX.

I recently noticed that the Urumi +25 gets a nice S scaling in DEX with a keen infusion. If you really invest many levels in dexterity you can even break the threshold of 600 AR! For a whip!

Does anyone know if there are other weapons in the games that reach S scaling in DEX with the keen infusion (or somber weapons maybe)? Or is the Urumi unique in this sense? I know that the swordspear has an incredibly good scaling with DEX when keen infused, yet, even this weapon has only A scaling for keen.