How to make ' and < map to the right keys (force change from ANSI to ISO)?

My separate keyboard (a Das Keyboard 4 Ultimate with ISO layout ) has, to my chagrin, a different and erroneous keyboard mapping than the MacBook's built-in (also ISO). The biggest annoyance is the different mapping of the ' and < keys. The built in laptop keyboard is like so (Norwegian locale, ISO layout): While the separate keyboard behaves like so (ANSI layout): This is not the correct layout. E.g. the Enter/Return button is wrong (1 row). It should be like this (again ISO layout): Note that the Enter/Return button is 2 rows high here. Unfortunately, the Mac setup does not fully recognise the keyboard: … even though it lists it in System preferences, under Modifier keys: Changing between ISO and ANSI does not help: Note that the Ultimate keyboard is completely blank: Finally, on the Keyboard Setup Assistant intro screen, it is stated *“Your **Logitech** device cannot be identified and will not be usable until it is identified”* (Emphasis mine). While I have a Logitech mouse, the keyboard is, as described, from another manufacturer. I have never attached a Logitech keyboard to the computer. I have tried to search for answers here on Stack Exchange. I have found similar topics like this , this and this , but none that answers this issue.