Good morning, Robert;
First, what are you doing up at 0400?
Next, I do have a body cap with a pinhole for use on a 6x6 camera, but I have not really done anything with it. The thought of doing something like that with the 4 by 5 had not occurred to me, but then, I do have a couple of lenses for them here. It is not something that that has been of significant interest to me. I have not yet felt that I have mastered what can be done with the movements of a view camera.
Enjoy; Ralph, Latte Land, Washington