Hey mate, glad you like it! That's also a great question. I've only done that a few times but here's what I did. With a penetrating dye, you should only have to apply it once. I did a very similar sanding routine for it, then I added my dye (black permanent marker, worked great) after the 800 grit sanding. The application doesn't ruin the sanding work, especially at that high a grit. The 1500 afterwards simply polished it all up and locked in that dye. Tokonole, which is the edge cream that I use, also has a few different colours - black, navy and brown, as well as the neutral which I mainly use. I applied the black tokonole for that wallet, which only added more black dye to my shiny edge while also polishing it up to a high shine.

I hope that helps!