I'd definitely visit your coffee shop! I have a thing for Japanese design--besides that other thing for coffee, haha.
I will have a Hario siphon for occasional purposes when the customer wants a bit different coffee experience.
I love those! They are so beautiful, and now that you say so, I think I may buy one someday.
I bought one Hario Siphon about 6-7 years ago and I rarely use it. Yet it is a cool coffee gadget!
I love Japanese inspired interiors, made with simplicity and reference to nature!