I was looking into the possibility of using an ETA with attached DD module. I don't think the 2824 will work though, as from what I have been able to research, the 2020 chrono module is only set up for 6 - 9 - 12 configuration. For a tri-compax style chrono with running seconds at 3, the only option I have been able to source is the 2892-A2 with a DD 2021 on it.
And as Bike Mike pointed out, servicing it will prove a little difficult.
If only I could find a gen Breitling B36 movement that would solve my issue, but they are very, very difficult to source.