I ask this because it came up in conversation at the studio I work at.
We were wondering if there was a market for a service to take digital images/files and and record them in black and white negative stock. So you would be able to take that nice image you scanned off your LF negative, labored in PS to perfect, and place it back on a negative stock for either printing or physical archiving. I ask this aware that there are those who create inkjet negatives.
This is more out of curiosity, although we have accomplished this to a high degree of quality in our studio.