I can finally show this off. This is one of those things that I would work on for a little bit, shelve, work on some more, shelve again, work on again, etc because there was a lot of interesting plugin interactions that I had to figure out. Changing the SystemSet was kind of the easy part, but I had to account for:
The game clock has to draw from the System graphic instead of a separate picture, as well as from a "System3" graphic format I created.
The main menu has a strangely shaped cover up piece between the hero faces and the list items that has to be updated upon the changing of the System graphic.
My Party menu, Enter Name menu, Save menu, System menu & Other misc graphics had to be updated to draw from the System & System3 files.
The Save menu changes one of the child windows based on the System set used in the file being checked, while the rest of the menu uses the currently loaded System graphic.
FaceSet borders were changed to a black outline since it's more neutral than the brown one I had before.
The only thing I might change at this point is to make the "1,2,3,4,5,6" part into little color squares or something... whatevs.
(Ignore the weird character names. I keep forgetting these files had those for testing messages & line lengths where where names are mentioned.