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Last year I photographed several specimens of this species again in the same area, and I now have a better idea regarding the identity of this sp.: I think it is Anastoechus trisignatus, a species present in the nearby countries.
This new ID is based on a (bad) photo, distinguishing character and distribution in this paper:

https://www.zobodat.at/pdf/DENISIA_0014_0353-0384.pdf