I think your only option is a new pad.
You have chunks of the pad missing and it also appears warped.
A dash cap is a good option if the basic structure of the pad
is fine...you can install a cap but I don't think you are going to like how it looks.
Plus you already have the pad out of the car...the hard part is done! We sell a nice ABS pad that is not crazy money that would be a good compromise.