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I hade some problems making this work for me. NOTE: This would'nt work with a Rect2DMask! You need to use Mask for it to work on Unity 2019.3.15f1.
Thank you! I followed your second route and I updated the ZTest to "ZTest[unity_GUIZTestMode]" and the Blend to "Blend SrcAlpha OneMinusSrcAlpha"....
I encountered this problem with 2018.3.2f1 and was able to fix it by reimporting the shader in question. By doing that it posted another 2 errors...