Help Creating a Snout Preset

Hello, I'm wanting to make a piece of CC similar to the skin detail by CCadence that gives sims an animal-like snout. Unlike theirs, mine will be closer to the original position of the mouth so that seperate teeth are not required. So what I'm wondering is if I should make this a face preset or a skin detail like CCadence's. If I make it a skin detail I would like to know how CCadence did the same, since you can see that theirs has different vertices from the Sims 4 head mesh. I'd still like to be able to change other parts of the face like the eye shape. Also I'd like to know the best way I can make the male and female versions as similar as possible, thanks!

Here is a link with CCadence's CC: www.patreon.com/posts/catmumcadence-78200943?l=fr