As per the description, I created new textures for both based on their non-hologram appearances. These were desaturated and then tinted blue, then set up in a 2x2 flipbook animation with varied brightness to get the flickering effect.
The vanilla Dodonna hologram model actually uses different UVs, which you can see if you look at the original version videos. You can see the medals on her chest are mirrored. I created a whole new hologram model for her based on the regular appearance model, so it retains the proper non-mirrored UVs. Vandar's hologram model didn't change the UVs, but I did have to edit the eye meshes to accommodate the way they faked the blinking with textures (they animate brief swaps between two different sets of eyeball meshes). The intersection didn't play nicely with the mesh alpha approach.