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Chrysomelidae are among the most important hosts in the Coleoptera for Tachinidae, together with Cerambycidae.
So it helps only a little.
The host is consistent with Meigenia.
Moreover, Meigenia is described as having a preference in ovipositoring on older larvae. Therefore, pupation from pupae or even adult Chrysomelidae is again consistent with Meigenia.

So, Meigenia is still the most likely bet.

Theo Zeegers