using a 9 color texture for masking 9 texture elements

Hi,

Im creating a Configurator where the user can change the colors of the sticker layout. I do have a solution but i dont know if this is a good idea. see the shader code below. my questions are

1 can i use this shader in android or ios
2 wil the code below perform well since i use so many if statements
3 does anybody have another suggestion to solve this because i need to mask 8 parts of the sticker layout
4 i also get jaggies at the edges between different colors any suggestions?

Code (csharp):

1. Shader "MMWizard/multicolor" {
2.     Properties {
3.         _MainTex ("Mask (A)", 2D) = "white" {}
4.         _Color1 ("r 64", Color) = (1,1,1,1)
5.         _Color2 ("r 192", Color) = (1,1,1,1)
6.         _Color3 ("g 64", Color) = (1,1,1,1)
7.         _Color4 ("g 192", Color) = (1,1,1,1)
8.         _Color5 ("b 64", Color) = (1,1,1,1)
9.         _Color6 ("b 192", Color) = (1,1,1,1)
10.         _Color7 ("white", Color) = (1,1,1,1)
11.         _Color8 ("black", Color) = (1,1,1,1)
12.     }
13.     SubShader {
14.         Tags { "RenderType"="Opaque" }
15.         LOD 200
16.        
17.         CGPROGRAM
18.         #pragma surface surf Lambert
19.  
20.         sampler2D _MainTex;
21.         fixed4 _Color1;
22.         fixed4 _Color2;
23.         fixed4 _Color3;
24.         fixed4 _Color4;
25.         fixed4 _Color5;
26.         fixed4 _Color6;
27.         fixed4 _Color7;
28.         fixed4 _Color8;
29.  
30.         struct Input {
31.             float2 uv_MainTex;
32.         };
33.  
34.         void surf (Input IN, inout SurfaceOutput o) {
35.             fixed4 c = tex2D (_MainTex, IN.uv_MainTex);
36.             //o.Albedo = 0;
37.            
38.             o.Albedo = _Color8.rgb;
39.             if(c.r > 0  c.r < 0.3){ o.Albedo = _Color1.rgb; }
40.             if(c.r > 0.6){ o.Albedo = _Color2.rgb; }
41.             if(c.g > 0  c.g < 0.3){ o.Albedo = _Color3.rgb; }
42.             if(c.g > 0.6){ o.Albedo = _Color4.rgb; }
43.             if(c.b > 0  c.b < 0.3){ o.Albedo = _Color5.rgb; }
44.             if(c.b > 0.6){ o.Albedo = _Color6.rgb; }
45.             if(c.r == 1){ o.Albedo = _Color7.rgb; }
46.            
47.         }
48.         ENDCG
49.     }
50.     FallBack "Diffuse"
51. }

thanx in advance