I'm not sure what kind of duality that they would be able to do for like half of those skins. Candy Kayn on principle, because of the pun. The only skin I see REAL potential with is the first one. Except I'd definitely call it PROJECT Kayn.
Where for Jinx they hint that she might be corrupted by the Program, I think PROJECT Kayn can take this concept all the way, with Rhaast being some kind of AI in his scythe or whatever weapon they roll with. That way, they can take the path of Kayn destroying the Program Rhaast and breaking free as a true PROJECT in his blue form, or succumbing to the corruption and becoming a full on Progam in the red form.