I haven't read through this entire thread but anyone remember the Void's Star Wars experience in Disney Springs? My family and I did that a few times and it was incredible. It seems like the shuttered Starcruiser could be repurposed into a VR attraction. Given its size, I bet you could have several different parties working their way through a VR Star Wars adventure simultaneously. Just knock down some walls between sets of guest quarters, and you've got quite a bit of space for a number of groups.
Didn't they use some kind of special window-less shuttles to take folks from Galaxy's Edge to the Starcruiser? They could be repurposed for the same thing, making the trip seamless for the guest.
Just an opinion but with high-end VR, you could have a 3rd attraction as part of Galaxy's Edge with a fraction of the cost of building a new dark ride. Plus, new content can be created at will, to keep things fresh, much faster than re-skinning or re-theming an existing ride.