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Huh. I would glue. Needs to be flexible. I would consider Shoe Goo or 100% silicone.
Seems like anything you sew, no matter how you do it, is going to cause undue friction.
Also, I would bevel the edges where the 2 ends meet.
This guy has videos on a few. https://www.youtube.com/watch?v=5OzjurvpX1E
He even made one up to 2500 grit or so and has a video of him finishing off a cheap carbon steel katana type sword I don't recall if you put up a vid on how to do one at that level.