I have the ability to make four Black and White silver gelatin separations on Galerie G 4 . I think these would work for this process, or the RC version is also possible.
I have made this offer to any worker out there to provide the prints, I do not have enough time in my life right now to go into the process farther than this.
The worker would have to figure out how to register the supplied prints and then go from there.
I can be reached at firstname.lastname@example.org for any serious worker wanting to try four colour carbro... not to be confused with carbon.