Jeff,
We have a black & white darkroom in my studio. Because we offer Fiber printing I wanted to be able to print fiber from our digital work to round out our offerings and set us apart from our competition. I ran some tests and plotted the tonal shifts of a copy negative and created a curve adjustment that corrects for the shift in tones that you get from a copy negative.
This is what we do,
-Epson 2200 printer
-Do restoration
-Apply copy negative curves adjustment
-print on enhanced matte
-shoot copy negative and print
The way I created the curve was visual, I created a step wedge and added it to an image for testing. Printed it straight and shot a copy negative then made a print (a whole bunch of prints)where the mid gray and white and black matched. I then opened the original test image and by comparing the straight print with the copy neg print and clicking on each and ball parking how much of a shift there was on the patches where detail wasn't lost I was able to create an adjustment curve.
I basically looks like the reverse of a normal s curve. Copy negs loose detail in the highlights and shadows and increase contrast in the midtones. The adjustment curve lights the quarter tone and darkens the three quarter tone so that contrast is increased in the shadows and highlights and decreased in the mid tones.
My point in all this (besides sharing something I think is exciting), is to suggest that you could create an adjustment layer with a copy negative curve and make a print and then take it to any good lab that does fiber and have a copy negative and 8x10 made. You would not be limited to a lab that specializes in this. Give them a straight print to match as a guide.
You would need to inspire the lab about the possibilities to run the tests to figure the most appropriate adjsutment curve to work with thier copy negatives.
Or you could get the epson printer ... but you could probably charge more for the fiber prints ...
Loads of luck,
Roger