Digital BW, The Print

I'm exploring working with a print studio that doesn't linearize their Epson 9900 (yes, really) and I'd like to try calibrating my image file to their printer. (Why work with them at all? Great price and quality, other than the lack of linearization, and I haven't found any better alternatives for large format printing). 

I've measured with my PrintFix Pro a 21-step test strip printed on their 9900 and want to use the luminosity data to make an adjustment curve to correct for their printer. While I can use the data to eyeball how much to lighten my image (their printer prints too dark, significantly so in the shadows), my question is whether it's somehow possible to input the luminosity data directly into Photoshop to achieve something more accurate. 

Mark