I was also thinking it would be difficult to dye the seats. Didnt have the guts to try it and mess it up. The interior I have is what the car came with and without the freckles it really is in good shape. Are the new interiors good quality? The dye I have worked great on the molded plastic inserts around the door handles that were faded after time in the sun. (my bird is a convertible - I'll post a picture if I can figure it out)
I'll try the vertical areas next to the seats first. Worst case, I guess I'm buying new.