This is something I've requested that might already be a work in progress for Reallusion. I've suggested that they expand the use of Vertex assignment (select area on body and range of verts on hair/cards as a hybrid that could be assigned weights by distance from the root of the hairs via texture brightness and or utilize physics textures. This way we should be able to add hair/fur anywhere and will respond with physics.

Not only that, vertex assignment could work with clothing with physics on top of the body with soft physics enabled so if the belly jiggles around, the clothing  should always conform and not clip through the character.