Interesting approach. I have camera bags that have dividers attached by Velcro, so you can configure them pretty much any way you want. That would be useful.
I really like my new Mini 5 Pro, but puzzling stuff does happen.
I was flying it in a local park when it occurred to me that the map was not showing the blue lines for the flight path, or the red line between the drone and home.
You can see...
I found the dimensions of the RC Pro 2. Your are correct, sir. No way it'll fit in the stock Mini 5 bag:
Key Dimensions & Specifications
Dimensions: 182 × 139 × 61 mm (Length × Width × Height) when folded.