I think it's an easy implementation for the animations. But for the illustrations, it's going to be pretty rough and its going to take too much time. I can make various presets to make it easier, but there's also the fact that I have to sync both the animation skin tones and the illustration, make multiple copies of the illustrations, then do it again whenever I add a new illustration/animation. I can't just do one or the other if it were for immersion, like you just said.
So yeah, while I do think it's a neat feature, I don't think I can deliver it in a satisfying way.