Cameras are controlled by the IPMB module, not the BCM.As for upgrading to the larger 12" screen, I bet it will be doable without being prohibitively expensive - but it will take time for enough parts to arrive in depots / Ford Parts warehouses.
It will get even cheaper when enough Broncos hit the road that more show up in salvage yards.
As for the APIM (that's the sync module) I would think it might be possible with just adding the screen, there is even an entry in the APIM via FORSCAN where it sets the size / orientation of the screen / display.
The cameras are controlled by the BCM. I highly doubt Ford added another module JUST for the upgraded cameras.
The way to tell for sure?
Get a VIN for a Bronco equipped how you want yours to be equipped (12" screen, cameras etc). Download the AsBuilt file for the new Bronco AND your Bronco (fromt Motorcraft) then use a program (FREE) called AsBuiltExplorer and you can directly compare BOTH AsBuilt files.
This will tell you where in the BCM (Body Control Module) and other modules where settings are different based on having (or not having) the options you want to upgrade to.
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