I've read about early color experiments (amazingly colorful -- much more than one would expect!) but no experience with them. Could you post a few sample stills (i.e.: target color, your B&W sources, and your present results) and what technique(s) you are trying?

Just off-hand, I'm thinking one would use a standard R-G-B recombine. Red obviously is from your B&W-red-separation while Green & Blue (being identical) are from your B&W-green-blue-separation. Thereafter, just work on the R-G-B channels, remembering to duplicate all Green settings to Blue.