Good news, everyone! After so many of you have expressed your desire for an ISO version, we finally decided to make it along with the ANSI version.
As for the Enter key, we will only provide bar-shaped Enter which might beg for some explanation.
The main reason is that bar-shaped Enter is more ergonomical. This layout also allows us to make the rightmost UHK keys shorter by half unit than on most keyboards, which makes the UHK more compact, and the keyboard halves more symmetric.
According to our experience, it's very easy to get used used to the bar-shaped Enter key. You can even swap the functionality of the bar-shaped Enter key and the "\" key above it on your UHK, making the "\" key send Enter.
Feel free to read why the bar-shaped Enter key is more ergonomical.