Is there a 'do not draw' shader?

I have an odd case. I have a multi-material mesh that I cannot modify, but there are some submeshes I need to not draw at all. Like totally transparent. I can change the mamterials on those submeshes tho. But making them totally transparent seems like overkill, if I could have a shader that culls both front and back faces(?) Would that work? Basically, ‘ignore this face completely’ ?

As far as I know:

Shader "Nothing" {
	SubShader {
		Colormask 0 Zwrite Off
		Pass {}