Delete Uv2 of a mesh?

Disclaimer: I've never played with the uv2 channel, so these are the rantings of a madman.

I see 2 options :

1/ Assign the uv2 as null

2/ Create a copy of the mesh, but without assigning any uv2

example script :

In a new project, new scene, create an empty gameObject. Attach the following script, and add a material with a texture to see what's happening.

In play mode : press G to generate mesh with UVs; press R to null the UVs; press U to make a copy without UVs.

 using UnityEngine;
 using System.Collections;
 
 
 [RequireComponent( typeof(MeshFilter), typeof(MeshRenderer) )]
 public class MeshRemoveUV : MonoBehaviour 
 {
     
     //    -------------------------------------------------------  Persistent Functions
     
     
     void Start() 
     {
         GetComponent< MeshFilter >().mesh = GenerateMesh();
     }
     
     
     void Update() 
     {
         if ( Input.GetKeyDown( KeyCode.G ) )
         {
             GetComponent< MeshFilter >().mesh = GenerateMesh();
             return;
         }
 
         if ( Input.GetKeyDown( KeyCode.R ) )
         {
             GetComponent< MeshFilter >().mesh = NullifyUV( GetComponent< MeshFilter >().mesh );
             return;
         }
 
         if ( Input.GetKeyDown( KeyCode.U ) )
         {
             GetComponent< MeshFilter >().mesh = CopyMeshWithoutUV( GetComponent< MeshFilter >().mesh );
         }
     }
     
     
     //    -------------------------------------------------------  Other Functions
     
     
     Mesh NullifyUV( Mesh mesh ) 
     {
         mesh.name = "NullUVs";
         mesh.uv = null;
 
         return mesh;
     }
     
     
     Mesh CopyMeshWithoutUV( Mesh meshWithUVs ) 
     {
         Mesh mesh = new Mesh();
 
         Vector3[] verts = new Vector3[ meshWithUVs.vertices.Length ];
         System.Array.Copy( meshWithUVs.vertices, verts, meshWithUVs.vertices.Length );
 
         int[] tris = new int[ meshWithUVs.triangles.Length ];
         System.Array.Copy( meshWithUVs.triangles, tris, meshWithUVs.triangles.Length );
 
         Vector3[] norms = new Vector3[ meshWithUVs.normals.Length ];
         System.Array.Copy( meshWithUVs.normals, norms, meshWithUVs.normals.Length );
 
         mesh.name = "WithoutUVs";
         mesh.vertices = verts;
         mesh.triangles = tris;
         mesh.normals = norms;
 
         mesh.RecalculateBounds();
 
         return mesh;
     }
     
     
     Mesh GenerateMesh() 
     {
         Mesh mesh = new Mesh();
 
         Vector3[] verts = new Vector3[ 4 ];
         verts[ 0 ] = new Vector3( 0, 1, 0 );
         verts[ 1 ] = new Vector3( 1, 1, 0 );
         verts[ 2 ] = new Vector3( 0, 0, 0 );
         verts[ 3 ] = new Vector3( 1, 0, 0 );
 
         Vector3[] norms = new Vector3[ 4 ];
         norms[ 0 ] = -Vector3.forward;
         norms[ 1 ] = -Vector3.forward;
         norms[ 2 ] = -Vector3.forward;
         norms[ 3 ] = -Vector3.forward;
 
         int[] tris = new int[ 6 ];
         tris[ 0 ] = 0;
         tris[ 1 ] = 1;
         tris[ 2 ] = 2;
         tris[ 3 ] = 2;
         tris[ 4 ] = 1;
         tris[ 5 ] = 3;
 
         Vector2[] uvs = new Vector2[ 4 ];
         uvs[ 0 ] = new Vector2( 0, 1 );
         uvs[ 1 ] = new Vector2( 1, 1 );
         uvs[ 2 ] = new Vector2( 0, 0 );
         uvs[ 3 ] = new Vector2( 1, 0 );
 
         mesh.name = "HasUVs";
         mesh.vertices = verts;
         mesh.triangles = tris;
         mesh.normals = norms;
         mesh.uv = uvs;
 
         mesh.RecalculateBounds();
 
         return mesh;
     }
 }