There are already similar machines made in Korea that do exactly this with BCH. I hope to see them start getting deployed!
Anything with a screen can in theory accept BCH with software updates. Will it happen? Maybe for some. Maybe we should focus on the big providers so thousands of machines updates atst.
The thing about Japan is - 75% of restaurants use these cash machines. I don't blame them, it means the employees never have to handle money. Easy raspi mod could make them take BCH.