[ reflected 90deg away from the centre which is left unaffected ...
I don't understand what you mean by"reflected 90 degrees from center. Reflected off of what?
I think that the first thing that I will do is to measure the distance from a single pinhole to each separate focal plain. Then use a pinhole diameter around the average of optimum for each. Then take some images with the separation filters removed (I am speaking of the "one shot tri-color camera). Then put the filters back in, Take more shots and examine how the different colors affect the images.
I am glad that my question has sparked some interest.