I’m really sorry for the very late reply here. Your reply came to me just as I was taking some time off and it seems to have fallen through the cracks!
I’m just touching base to see if this is still causing you some pain.
I think you are correct in that child steps will not help in your specific scenario. However, I’m not sure Octopus currently has the ability to do exactly what you are after here.
Is your primary issue here performance or a bottleneck in your deployment? If it is, I could get some help from our performance guru’s which may be able to provide some other ideas or thoughts on how to get around this issue.
Again, I’m very sorry for this late reply. Please let me know if I am still able to help.