How can I remove shadows from alpha cutout?

Hello, I have been playing around (for a few days) with the new Unity Adam Character shaders available on the Unity Asset Store (https://assetstore.unity.com/packages/templates/packs/adam-ep2-ep3-character-pack-115793) and they are perfect except that they don't allow the option for an alpha cutout (aka alpha injection mask or alpha occlusion mask) that I need to prevent the skin on my skinned mesh from clipping through my clot$$anonymous$$ng during animation. I have managed to get as far as clipping the surface texture, but there are still visible shadows that pop up on the clipped part of the mesh. I was wondering how I would prevent the shadows from appearing on the clipped part of the mesh. Below is an example of what it looks like now, and what it should look like (ac$$anonymous$$eved using morph 3d Volund variant shader). Please help me. Anyt$$anonymous$$ng will be appreciated. Thank you.

If helpful, Here is some extra information: Unity version 2018.2.18f1; Windows 10; Deferred, Linear;