I don't know if this would appeal to others, but there are a bunch of kydex and leather makers doing sheaths. I would be more interested in a full coverage cordura case of some sort. Honestly, I'm going to get much more use than from a sheath. With a double zipper if would still be relatively easy access. They make some for katana's and fencing swords. Also, would have room for a nice Scrapyard logo.

Scrapizashi in sheath:
"Did that guy just walk by with a sword"
"Yes, I'm already calling 9-1-1"

Scrapisashi in case:
"Wonder what that cool logo is for?"