QTR-Quadtone RIP

Can somebody please help me. Is there any way I can print from photo shop only using Light cyan and Light magenta channels on my printer. I need this so I can put white ink in those channels and print white underbase. I have Epson 2200 and I am using Photoshop with Gutenprint plugin. I know this posible with QTR but I hade problem with registration since I had to use Photoshop for color image. So, I would like to use photshop with gutenprint and to maybe color every image in Light Cyan Light magent mix and than print. I dont know if something like this is possiblle or some other idea. Thanks in advance