What's the quickest method of fixing the last 4 colors problem?

I'm assuming the missing numbers are for NPC's?

Well palette 6 is used as a placeholder for switching layers colors and I believe NPCs share palettes 1 to 6 too. The chocobo and magitek armor share palette 7. The rest of the palettes are for inanimate objects for the most part...

I was interested because I've been playing through Final Fantasy 6: A Complete Hack, and it's pretty hilarous, but I find myself put off by the HORRIBLE sprite work in the game, and I'm strongly tempted to do some substitution...

I saw this hack on YouTube and it looks horrible. The dialogues might be somehow funny, but it seems this hack lacks in a lot of departments. I can't judge too much because I haven't played it so...