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1. Valery is the top Tephritidae expert who, e.g., identified and sorted the whole collection of the Berlin Naturkundemuseum recently.
2. The Chaetorellia complex is very tricky and needs DNA study, it cannot be easily identified with a simple key. At least one needs to see a lot of specimens, males and females, to estimate the range of variety and overlapping of the characters.
3. To know the host plants is very important. The host plants host the larvae, not the adults (who, however, mainly mate on the host plants before the females oviposit there). Adult flies go where obtainable nectar is offered.
3. None of your photos shows a Centaurea species.