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I agree, but it IS a Tachinid! Congratulations.
You can see the bend in vein M (though not as sharp as in many other Tachinids, I agree).
Another big clue, if you know where to look for, is the long proboscis.
It is extended into the flower on the picture.
This is a clear hint: it is a member of the genus Siphona.
Impossible to tell the species, Siphona is the most difficult genus in Tachinidae in Europe to identify. I won't even try.


Theo Zeegers