This isn’t on Hal’s list, but I strongly recommend using Bobson Dugnutt’s version of force ghost Luke on Ach’To when it is finished as it drastically reduces the level of blueness and makes it more in line with the OT ghosts.
I’d definitely like Luke’s ghostly effect to look less… awful, but I’d also throw Jonh’s work at fixing Luke’s hair into the ring, because for me that wig is even worse than the blue effect.