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Unfortunately, the fly was not willing to throw itself on its back in front of me.... Instead, it disappeared very quickly after four photos.
As far as the wing veins are concerned, you got confused by the middle picture, which probably shows a fold in the wing. P1 does not narrow significantly towards the tip. Here is another view of antennae and wing tip. I still suspect an aberrant T. sudeticus...

As to T. eggeri: your description says on p. 53 "First antennal segment yellow, second red, third black with usually something red at the base." But in our case all three segments are black.