I mean that there are so many differences between those layouts and US-'English' ANSI
that they need their own, complete, sets to get the authentic Cherry-look .
English modifiers/numpad etc are acceptable to many North-European users, many already have them !
German enthusiasts can probably live with 'Print' instead of 'Druck' usw,
but wouldn't surprise me if there also is a home-market for a full German replica-set .
The French in particular, but also the Spanish and Italian prefer to have everything in their own language ..
Entree !!
EDIT :
IBM once offered language-conversion kits as did a few other quality-manufacturers, like NorthGate and DEC .
Existing stock could quickly be re-keyed and directed to another market where they where needed .
Of course it's a lot easier if you don't have to worry about row-profiles