Houdini -> Unity - packed channel shader

I’ve been following this excellent tutorial for channel packing an explosion flipbook in Houdini. The tutorial includes shader set up in Unreal. Can someone point me to either a shader for Unity or a resource for setting this up in Unity’s Shader Graph?

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following up: here’s the graph I made in Unity. It essentially does the trick (I had to swizzle the red and blue channels because I somehow got them switched in my render). However, it’s rendering as a cutout texture instead of alpha blending. (I do have the surface method set to transparent and the blend mode set to alpha). Does anyone know how I can make this shader render with transparency?