Can the ATEM Mini do what I do in Premiere?

I rented the ATEM Mini Pro ISO to see if it would save me time but I can't figure it out.
If the ATEM Mini Pro ISO can't do this, can the Extreme do it?

I apologize if I get the lingo wrong. I don't have much experience with switchers.

Currently, in Premiere, I edit in multicam the recordings of 3 cameras. Camera 1, 2 and 3.
The issue is this:
In Premiere, my Camera 1 is a nested sequence of the following 3 elements.
A recording of Camera 1 (green screen) with a green screen key applied.
A recording of my Camera 2 at 50% scale and positioned to the left.
A full screen still image png/jpeg that is the background to the two above.
(I'm attaching an image to clarify)

In premiere I can easily switch between that Cam 1 (nested sequence), Cam 2 and Cam 3.
My understanding is that with the switcher I'd need to have Cam 1, an upstream key and a PiP with Cam 2 simultaneously.

Can somebody correct me and guide me?

Thank you in advance.

The mini Pro wont The Extreme will as it has supersource and 2 DVE's