This may be another one of my crackpot ideas, but it occurs to me that maybe you don't need to go through a laborious process of internegative making to turn a 4x5 negative into a cyanotype. Or bringing a computer, photoshop, and laser printer into the act. I'm taking strictly "analog". They make UV LED's these days, don't they? Then why can't a light bank be made up to fit an enlarger, and make cyanotypes with the enlarger?