You caannot (or should not) use a Dhchromate bleach for rehalogenizing. You should use a Ferricyanide bleach for this type of process. I know that some metals can be used to replace silver images to give various colored images, and even silver itself can be re-formed to give different colors.

The process itself is very complex if you wish even some degree of color, as it is similar to the original Kodakchrome process but with metals, not dyes.