I think the perfect process for low productivity is tri-color carbon with original pin-hole separations made in a separation camera. That would be setting the bar pretty high.
Jim Browning has suggested in camera color separation based upon silver-gelatin chemistry with dye spectral sensitization specific for each color "cabon" tissue. This remains in the back of my mind as I work on a panchromatic silver emulsion. Color separation is at the core of all my work. I have been facinated with it since I took my first course in ColorPhotography.