You'd need to use a combination of Cyan, Magenta & yello9w dye couplers, their are other couplers. There was an article in a pre-WWII BJPA about the use of dye couplers for B&W use as toners and this was reprinted a few times over the years in shorter forms. I have them somewhere.

Chromogenic B&W films don't use a black, XP-2 is a brownish colour the Agfa version was even redder.