This battle was done entirely on auto using a Gungan team and the Boomadier Omicron. After some initial testing and a few runs I've noticed there is some RNG between the droid abilities that makes this not entirely reliable for a full completion, but usually falls in the 3.1 - 3.6 million range.
You can complete this run as a "Guided Auto" fairly reliably by simply prioritizing STAP and Droideka kills on each round.