So after digging around on YouTube, I found this recent AVIN promo video of their Android 8.1 interface (with no audio, because it's 2019) that does show settings with the 360 cameras as a selectable option. Nothing of it in action though, and no selection for the front bumper cameras (though I barely use those anyways). Good sign regardless, though I'm still not ready to pay a premium to be a guinea pig
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(camera options at about 1:20)
***edit*** To expand on this, I don't know if you can switch between the rear camera and the 360 cameras at the press of the camera button on the center console to the right of the gear shift lever as you can with the factory system, since it appears there is a separate selection for the rear factory camera and the 360 cameras in the AVIN system settings menu. I switch between these views quite often when backing up into my garage parking space.