I figure, one other problem with adapting scarfs with current riders, would be with the amount of form changes of our current riders(more specifically W and OOO), I doubt a scarf could harmonize with all the forms, color wise especially. Unless it'll be a color-switching scarf, now that'd be pretty sweeet. Visually, some riders are just better off without scarfs.
All things considered, I'm listing this is as one of the reasons why I would LOVE to see a Rider with only one form, and that's it. Maybe an upgraded base form as a Final Form at the end of the series without it being a 31 episode long confusing trainwreck. But yeaaah...