Question Invisible Shadow Receiver for Deferred Built-in Unity 2019+

I have searched the forums for an invisible shadow receiver, for which I have found a couple materials but none of them are rendering correctly for me in Unity 2019 using deferred rendering with the built-in renderer.

I'm putting out a request here asking whether anyone already has a solution, of if possible, hack something together as my shader knowledge is pretty minimal. In addition, if the material could support light mapping, that would be a bonus!

Thank you in advance for your time and consideration.