You’d need to create your own or get someone to create correlating overlays for you and then you’d animate those into your intro scenes. Here’s a guide on animating overlays if you need:
You’d make the duplicate character look the exact same as your original MC apart from the hairstyle (one would be bald and the other would have any other hairstyle).
And yes, you could just remove the option to customise hair but I thought you wanted to give the reader options for different wigs/hairstyles.