Frankly, I think more sushiyas should offer oshi sushi. It's pretty, it's easy, and they already have everything they'll need - except some boxes. I tried to get a local place - named, of course, Osaka - to carry it and/or okonomiyaki.
For the latter cabbage is cheap and it stores well. They could have a small space on the menu, or even a separate list - for the customer to pick from. And it can be made in the BOH.
Does anyone here know of places that carry either? Why don't others? I have my own thoughts, but I'd like to see what others have to say.