You can enjoy Accuradio on your Sonos players in Germany by changing the country setting in your Sonos.com account profile to a country where Accuradio is supported, i.e. Puerto Rico. After saving the changes powercycle all of your Sonos devices (and controller apps) and add Accuradio from the Add Music Service list.
Be aware that other music services which are not officially supported in the set system country might not show up in the Add Music Services list anymore after the above mentioned changes were performed.
The system country change won't affect connectivity of music services which were already added to your Sonos system before the change.