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I'm back. I've had a new good look at the fly and there really are no palps. What I thought were palps are just some folds on the proboscis. So it should be Eloceria delecta – which by the way is also a very delectable find. At least in Denmark this is a rare fly.
But I'm still puzzled by the keys. What I took to be the apicals on the scutellum apparently don't count as apicals and my converging subapicals (one is missing) are really the strong crossed apicals. This is unfair ;) Forgive me for quoting the couplets in CMPD and the Central European key:

222 Subapical scutellar bristles not extending back to level of apices of strong crossed apical bristles

-Subapical scutellar bristles extending back at least to level of apices of apical bristles; the latter may be absent

107 Die Subapikalen des Scutellums reichen nicht so weit nach hinten wie die starken, gekreuzten Apikalborsten. Flügel: Der Abschnitt von M zwischen R-M und M-Cu ist kürzer als der zwischen M-Cu und der Beugung

-Die starken Subapikalen des Scutellums reichen wenigstens so weit nach hinten wie die Apikalen, die auch ganz fehlen können. Der Abschnitt von M zwischen R-M und M-Cu ist wenigstens so lang wie der zwischen M-Cu und der Beugung

I naturally chose the second option in both keys leading away from Eloceria delecta and eventually to Paratrixa polonica. The difference in the proportions of M should perhaps have halted me...

You have been most helpful, Erikas. Thank you very much!

Regards,