- Christiane Fürst and Jelena Nikolic (not absolutely sure about her but I think) have played all ECH tournaments since 2003
Yes, Nikolic did. Maja Ognjenovic almost did too, she was on wide roster in 2003, but ultimately didn't make the cut.
I think there should be play-off matches for places 5-8 when there's something substantial at stake, like direct qualification for the next ECh.