What I would do is Nicole is a telepath and telekinetic (so more like Monet) and Claudette is a teleporter and space manipulator (so more like Emplate). So the twins got both amped up versions of their older sibling abilities. And I'd keep the merging common to all siblings, since we have also seen Monet merging with Emplate recently. In their gestalt forms they should be able to combines their powers and become even more powerful.
The Penance form is a whole mess.