I decided to look more into carpet dyes. Eric G. suggested I search this board. There was one thread that referred to
Leather Repair | Leather Care & Restoration Products | Cleaner & Conditioner. So I checked them out. Turns out they do have carpet dyes and even list all the Porsche colors.
Here's the link to the Porsche Colors:
Porsche Interior Color Chart
I ordered the P970 Savanna and will post before and after pics when I do the project.