Incarnons do not change Riven disposition, so the Incarnon version of the weapon will have the same Riven disposition as the non-Incarnon version.
I would note that Incarnon genesis weapons are likely to have their Riven dispositions rocket downwards, though, because now everyone is using them.
Nataruk does mostly puncture anyway.
Other options include Incarnon Dread and Incarnon Miter, though either might be a little hard to acquire.