Single Pass Stereo Rendering for Standard Shader with Tesselation

Hi there,
I'm trying to add Single Pass Stereo Rendering support to a standard Phong tessellation shader found here (Phone Tessellation at the end).
The problem is that every example that I found for adding single pass stereo is for vertex/frag shaders, not Unity Standard Surface shaders.
Does anyone have a working example of single pass rendering shader that uses tessellation or know how to fix this shader? I'm adding the starting point shader below .
Thanks.

Code (CSharp):

1.  Shader "Phong Tessellation" {
2.         Properties {
3.             _EdgeLength ("Edge length", Range(2,50)) = 5
4.             _Phong ("Phong Strengh", Range(0,1)) = 0.5
5.             _MainTex ("Base (RGB)", 2D) = "white" {}
6.             _Color ("Color", color) = (1,1,1,0)
7.         }
8.         SubShader {
9.             Tags { "RenderType"="Opaque" }
10.             LOD 300
11.            
12.             CGPROGRAM
13.             #pragma surface surf Lambert vertex:dispNone tessellate:tessEdge tessphong:_Phong nolightmap
14.             #include "Tessellation.cginc"
15.  
16.             struct appdata {
17.                 float4 vertex : POSITION;
18.                 float3 normal : NORMAL;
19.                 float2 texcoord : TEXCOORD0;
20.             };
21.  
22.             void dispNone (inout appdata v) { }
23.  
24.             float _Phong;
25.             float _EdgeLength;
26.  
27.             float4 tessEdge (appdata v0, appdata v1, appdata v2)
28.             {
29.                 return UnityEdgeLengthBasedTess (v0.vertex, v1.vertex, v2.vertex, _EdgeLength);
30.             }
31.  
32.             struct Input {
33.                 float2 uv_MainTex;
34.             };
35.  
36.             fixed4 _Color;
37.             sampler2D _MainTex;
38.  
39.             void surf (Input IN, inout SurfaceOutput o) {
40.                 half4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
41.                 o.Albedo = c.rgb;
42.                 o.Alpha = c.a;
43.             }
44.  
45.             ENDCG
46.         }
47.         FallBack "Diffuse"
48.     }