I want to engage in 'deliberate practice'. Is there any way to set up a scenario so that I can pass units to a commander-less AI or vice-versa?

Deliberate practice is a practice technique where you almost single-mindedly focus on one aspect of play for some time.

I've hit a wall in my 1v1 OS at about 30 and according to my replays, most of my failures are due to poorly expanding or inadequately scaling my energy, BP, or build capability (i.e. getting stalled by the rate at which units leave their factory). In order to improve, I want to play scenarios where I literally only macro and have an allied AI take all my combat units to fight an enemy AI. I want this to happen pretty much automatically. I don't want the ally AI to have their own base.

Ideally I'd also like to be able to do the opposite: engineer a scenario where I can focus on unit control. Probably a scenario with 4 friendly AI + me versus 4 enemy AI, where I get all of the friendly AI's combat units automatically and have to manage the entire battlefield.

Is there a way to do either of these things?