In the end I though I would try the Canon M5 with a macro lens attached. No single shot was near half in focus on the subject so in desperation I tried for a series of hand held shots to put in a focus stacking program. Zerene Stacker did a grand job aligning things considering the way the position of the moth in each photo varied from shot to shot.

Camera set up - Canon M5 + Canon 18-150mm zoom lens + Raynox DCR-150 macro / close-up conversion lens.