Can't wait Man ! Awesome Work. What about twisting a bit and editing the colors of existing Packs to make new Factions, Like Frost, Water etc. That would be faster than starting from scratch.
i have a script that automatically recolors sprites to all the colors you want, so if you want clothes to be red and hair to be blue you can feed it all the sprites and it will do it. But really doing this with sprites is not the best idea, you should do it with a shader or by creating a new sprite sheet in memory when needed since that way you save space and remove the issue of having to deal with multiple files. i showcase this system in one of my projects, https://darkspire.vercel.app if you're interested i have a github repo that has a very basic version of it. If you're not a programmer you can use AI to customize the code to your liking https://github.com/TheNasky/Sprite-Chromator