Well, I eat my own words then! Purchase made 
Looking forward to this.
I was also looking at the scratchapixel one for a while, I eventually got lost in a haze of different functions talking to each other. I also only just found out that Custom HLSL nodes can be made to talk to and call each other from within the same material graph, which is quite cool. However, since your method works all on nodes - I won’t have to Thanks for this!
EDIT: Just checked it out. It’s quite performance intensive, which I kind of expected to be fair. What’s weird though is that the performance seems to climb up and down even if I’m sitting in the same spot in a scene. Haven’t tried it with a totally blank project so I’ll give it a go. Just wondering what kind of performance you get with this? I’m on a GTX 980 with i7. Could just be my end being odd.
EDIT #2: Yeah, definitely my end being weird. If I open the level AND open the material, then close the material, the frames go straight back up again. Seems a bit eratic, but who knows. Probably won’t happen in a packaged game.