Artus KG
Assuming you are talking about a UK issued EASA Licence, I can think of six options for you to maintain the continuity
(Revalidate) your SEP prior to its Expiry Date:
1) Complete (Pass) a Proficiency Check with a German Examiner who has obtained authorisation from the CAA
2) Complete an hour DUAL with a UK FI (with 945 Signing Privileges) in Germany
3) Fly to UK and find a UK Examiner to sign your Paperwork
4) Fly to UK and complete an hour DUAL with a UK FI (with 945 Signing Privileges)
5) Fly to UK and find a UK Examiner to conduct a Proficiency Check (not really worth it unless Rating expires and it becomes a Renewal)
6) Find a UK Examiner in Germany to sign your paperwork.
6) Would seem to be the best solution for you but, to make suggestions/offers, UK Examiners would need more information:
a) Where are you based, could you travel to, in Germany?
b) What is the Expiry Date of your SEP Rating?