It’s been a while, so I forgot about that one. But yeah it (Bricks & Tricks) has some variation of the idea too. (Might have to revisit it, see what things it does differently and possibly more efficiently.)
Still a spiral-specific node group may be neat, if it can be well parameter-ized, and possibly idiot-proofed. (Specially when dealing with particular idiots like myself.) 
Also it seems sub-features of other stuff doesn’t always come up in searches, so there may be some more oversight/redundancy there.