Hey Lila, I've been looking into your request and have given it serious consideration. While it is certainly possible, the time required to do so won't be feasible. I try to keep the pricing as low as I can because I want our asset packs to be as accessible as possible!
We would need to "build" and export more than 2,000 images with different layer configurations per character to allow for all the variations and combinations of facial expressions and outfits. Even when automated this would add a significant chunk of time per character, and increase the already high production cost of each character which would either push up the individual price point or increase the net loss per character.
(Fun little fact, our character assets are nowhere near profitable. It's actually thousands (not exaggerating) of dollars in the red, but I want to help fellow indies like yourself make games without having to sell their cars to buy art, and I'm committed to our outsourced artists who depend on their monthly income, especially while the industry is facing AI disruptions. The dream is that it will turn profitable in a few years!)
I love helping people out, and I'm sorry I can't help you with your request in this instance. <3