I'm not sure if this is what you want, but if the texture is the same for all the materials that use the same shader, you can:
(i)
Remove the texture property in the property block of that shader
(But keep the uniform variable in the shader)
(ii)
write a script and use Shader.setGlobalTexture(the_name_of_the_texture_varible, newtexture);
this way you won't have to loop through all the materials and change the textures one by one.
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