A script for changing the shader type of materials at runtime. In this example we're changing to use a custom occlusion shader required on AndroidXR and Meta Quest platforms for depth based occlusion.

ShaderTypeManager.cs

using UnityEngine;
using System.Collections.Generic;
public class ShaderTypeManager : MonoBehaviour
{
    [SerializeField]
    List<Material> m_MaterialsToChange;

    void OnEnable()
    {
        Shader targetShader;
#if UNITY_VISIONOS
        targetShader  = Shader.Find("Universal Render Pipeline/Lit");
#elif UNITY_META_QUEST || UNITY_ANDROID_XR
        targetShader = Shader.Find("Occlusion/OcclusionLit");
#endif
        for (int i = 0; i < m_MaterialsToChange.Count; i++)
        {
            m_MaterialsToChange[i].shader = targetShader;
        }
    }
}