Northen Kurdish keyboard layout for macOS includes German letters. Made for developers, also can be used as regular typing.
It is standard U.S. layout, with extra modifier when clicking options button:
e => ê
s => ş
c => ç
i => î
u => û
Those modifiers includes also german letters on its default places - right hand letters: ß ö ä ü
unzip kurdi-ya-jorin.zip
copy Kurdî ya jorîn.bundle to /Library/Keyboard Layouts/
open System Preferences > Keyboard > Input Sources > +
Select Kurdish and add Kurdî