Hi Andy,
Looking very nice...
Assuming you are looking at projector settings in Pangolin Live Pro for your setup of either Single Colour, RGY or RGB laser.
I think you should be able to connect the modulation for the green on your DB25 to the blue laser. and then it would work as an RBM (Red, Blue, Magenta) laser.
Important Note: I have not tried this myself and I would be tempted to wait for others to reply to this thread before changing this just in case I am being thick here. I would not want to be responsible for cooking your blue
If I am talking complete rubbish, please ignore me. But if others agree, you should be able to squeeze a third colour out of it this way and magenta is a really nice colour to have..
Mark