As far as I know there is no German Version of the pi-top  Bluetooth Keyboard. I hope there will be one in the Future.
The problem with the US keyboard are the missing German characters like üöäß. When I switch it to German via the settings in the menu then I get the German characters but I loose the ><| characters because the character “y” uses this key on a German Keyboard.
I could not find these - for Python programs - essential characters ><| via any key combination.
Please let me know if there is any solution for this.