One of my favorites artists whos Patreon I am releases a spritesheet for every component (base/body, tops, bottoms, facial hair, hair, items/weapons) with all the animation frames. You just have to place them on top in the correct order. It's really simply an grants a lot of freedom.
Btw: Do you have a Patreon including your work?
If you are interested in pursuing the layers idea - I'm a web dev and would be happy to build a character generator using your graphics that you can then release.