My group interpreted you it as you swing the whip as normal but generate the wall on hit.
Also if you used one like kinetic blade and extend range the range would increase to that distance making a super long sword.
Another GM and I interpreted as a wall of blades or a wall of whips, that can attack people next to it, but yours could work too.
Would you guys let that whip/blade threaten all areas or just for full attacks, considering the mythic side of this?One more thing, the kineticist must know those two forms?
Would time count separate or together?
If the times count separated this would fix the wall problem as you would manifest both effects in one round, but separately, more like an action economy thing than a merge, and both with the substance effects.