Digital BW, The Print

Originally posted this question on the Color Theory group - got no
answers! Will try here.
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Hello Group,

Can anyone tell me if there is any way (3ed party PC software) that
one can use to convert the curve functions in Photoshop (Transfer
Function - *.ATF, Curves -*.ACV, Map Settings - *.AMP) into an ICC
profile (.ICM, or *.ICC) ? 

I'm asking this question because I assume that if one has an ICC
file, one can use the "soft proof" feature in Photoshop to
view what the image will look like when printed on the particular
device associated with the profile. Thus, in theory, when making
density, or color changes to an image, while in the "soft
proof" mode, the user will see what the final output will look
like.

I'm making digital negatives for contact printing using
imagesetter and inkjet printers and have developed custom curves to
correct the tone densities of the respective materials. 
After the curves are applied to the image in Photoshop, the image
looks, as you might expect, very strange on-screen. If I had an ICC
profile for the litho film material with the curve applied, I could
make image adjustments in the "soft proof" mode. This
approach seems more intuitive to me.

Does anyone have any suggestions? Is what I'm suggesting a
possibility?  

Dave Spielman