You can put a new door on it and get a set of side skirts and just cover over the damaged rocker panel.
Doors can be gotten from Redline Autoparts out of Florida and Norms Fiberglass makes a set of side skirts as does RKSport.
RKSport side skirts might be easier to work with because of how they sit on the car and also because you can bend them if needed.
That is what I would do. Clean up the damaged rocker and primer it o it doesn't rust and then put side skirts on it.
This doesn’t sound like a bad option. Do you know if the aftermarket panel cover inside the door jam? I’ll attach pictures, but there is a fold in the metal.