I missed this part; that seems terrible for DC-DC charging. Though, now (as inefficient it may be), the 2400W AC port may be a good option for those wanting to charge dual-battery/house battery systems.
Some questions re: in attempting to acquire install the entire kit fully OEM:
What would be required source parts to have a fully OEM setup?
Which OEM parts are available?
What’s the issue with the camera, if you already have the Off-Road Premium?
If it’s just getting the grill and 20” Diode...