I can see the "skeleton" plate being very unique, but I think what others have voiced are also something I can agree. Maybe reduce the amount of the regular aluminum plate options to 4 instead of 9 like you said before, and put in 4 options of your "skeleton" plate. That should solve your issue with having too many options. For me, the color of the plate is not that visible when the keycaps are on top of it, so I wouldn't care that much having a lot of different colors of plate. With your build, I believe the main focus will be the different top, middle, and bottom frame color choices.