Digital BW, The Print

Does anyone have a suggestion for soft proofing piezography prints in
Photoshop?  I want to order a couple (warm neutral) from west coast
imaging but the image I'm working with is finicky - a large part of it
is under RGB 40,40,40 and I don't want to lose some critical detail -
so I'd like to get an idea of any changes I should make to prepare the
file.  For example, are there any other paper/printer profiles I could
use to soft proof that would be close to the piezography print?  

Thanks!

Brian
http://www.brianchapmanphotography.com