I'm using a Mac laptop with German set as the preferred language (the keyboard, however, is a standard US keyboard). With this setting, some keyboard shortcuts include the characters Ä, Ö, and Ü. E.g. ⌘Ä (command-Ä), ⌘Ö (command-Ö), ⌘Ü (command-Ü), etc.
Now, I produce Ä by first pressing ⌥-u (Option-u), and then pressing ⇧-a (Shift-a). I can't figure out any way of using this method to produce the equivalent of ⌘Ä (command-Ä). The same goes for for Ö and Ü.
Is there some way to produce these keyboard shortcuts on a US keyboard?