How create prefab variant in script non-reflection

How create prefab variant in script like this?

Code (CSharp):

1. Type prefabUtilityType = typeof(PrefabUtility);
2. MethodInfo method = prefabUtilityType.GetMethod("CreateVariant", BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance);
3. method.Invoke(null, new object[] { PrefabUtility.GetCorrespondingObjectFromSource(gameObject), "Assets/P.prefab" });