Ok then, color neg-pos paper has a contrast of 2.5 and the film has a contrast of 0.6 to give a final print contrast of about 1.5. Color pos-pos papers had a contrast of 1.0 and color reversal films have a contrast of about 1.8 for a final print contrast of about 1.8.
If you print color positives onto a neg-pos paper the print contrast ranges as high as 1.8 x 2.5 or 4.5 and with finesse as low as about 2 which is good for some scenes, but not others.
A soft B&W developer may or may not work. It usually cannot due to the fact that reversal papers achieved their low contrast by using 9 emulsions to spread out the curve, but neg-pos papers have only 3 primary emulsions and cannot be easily spread.
PE