Thanks Michele and Mary!
Michele, I know from experience that scarring over before replanting is key, for example, with cacti, and so your advice makes sense in the realm of DL roots, too. I would never have made that intuitive procedural jump on my own though!
I'll try both bleach and hydrogen peroxide mixes on some different DLs, as well as the shaded drying, and do a pictorial article to show my results. I love experiments like this, so thanks also to Mary for the nudge!