Dark Vader

I just got a 10.5” Android screen with trunk handle backup camera to replace my 6” CCC screen in my 2010 535i… I’ve seen videos on the install and it seems easy enough… the only real foreseeable problem is getting the wire from the camera through the rear ‘bulkhead’ that separates the cabin from the trunk… I don’t have fold down seats or a pass through… does anyone have any suggestions as to where to route the wires through into the cabin

thx!!