I've almost converted the entire paint set into sepia tones. The only problem is, I wasn't paying attention and skipped 3 colors. They weren't common colors fortunately, being bold red, bold orange, and soft cyan.
Should I convert them too, or just leave it the way it is?

If anyone is interested in using the base pallet I used to get the shifted RGB values from (if you want to load your build as greyscale or monochrome) I've attached it below. Just apply whatever filter you want and use a the dropper tool to get the shifted RGB values.