I won't consider other language alphas because it doesn't make sense to me to have JIS sub legends on a ISO-DE layout though.
If anything, ISO-DE is closer to JIS than ANSI is, what with the ISO Enter key and the &,(,) on 6, 8, and 9 respectively
(I'm half trolling, and not trying to persuade you one way or the other -- what really matters is whether or not a kit will hit MOQ, after all -- but in defence of German hiragana enthusiasts, I don't think this reasoning stands
. Of course, as a JIS user, I could argue that it doesn't make sense to have them on ANSI and so you should make this set JIS-only... but I'm only willing to take my tongue-in-cheek trolling so far!)