Nice to see someone else thinking along the same lines. I had considered taking one string and bundling 4-5 nodes, 2-3 feet of wire, 4-5 nodes, 2-3 feet of wire,..... etc and use for Halloween to light pumpkins. Had also considered a similar set-up to put flicker lights in luminaries.
One other option I thought of - go ahead and use the node(s) for flickering, then just program the nodes in between to do whatever else is wanted. I think this would work fine for luminaries, but would still be a problem in your PVC 'candle'.