[lightwords]

I don't see how it's a problem to stock all keyboard types, such as for the Nordics. It's the same layout, just with different letters. They could just have blank keyboards with the most commonly used layouts and put them in a laser etch jig for custom orders. Similar what they are doing now for screen protectors where they cut them in-store

[ccppurcell]

Different layouts have different size return keys, for instance.

[notpushkin]

ANSI/ISO is the main difference I think.

Now, Japanese keyboard [1] is a whole other beast, but for the most part layouts customizing ANSI and ISO blanks should work just fine.

[1]: https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2F...

[numpad0]

Yeah, there are mostly only ANSI, ISO, and JIS physical layout in this world, stamped differently to suit needs. JIS is only ever used in Japanese so just blank ANSI and ISO should cover everything(emphasis on should; corrections are welcome).