Door panel restoration and re-dying

The door panels in my 70 Dart are not awful. But they're loosening up on the corners/ends. I wonder if I might be able to hit them with a heat gun (gently), re-stretch and re-glue the material. THEN... I'd be interested in spraying a vinyl die on them to change the color.

And the armrests are in good shape, just VERY dirty. So -- clean and spray?

Thoughts and advice?

Scratching my head, I am,
JD