Without knitting two separate sections and seaming in the middle, is there a way to get cast on and bound off edges of scarves to match? For example, long tail cast on would match (or resemble) what type of bind off? Cable cast on with....??? Knitted cast on with....??
Start in the middle and work in both directions and you will have a cast off at both ends.
PS, I mean by Casting On with waste yarn and picking up the stitches to work the other way, rather than seaming.