That would be very possible if it were a simple zoom or panning shot, unfortunately it’s much more complicated so significant castle damage would probably have to be modeled in 3d and tracked onto the existing shot. Needless to say it’s a bit beyond my capabilities.
A thought I had was potentially just tracking some cracked/crumbly textures onto it, so at least it doesn’t look so pristine.
Yup, that would be better than nothing.
Even if it doesn’t pan out, no biggie. It’s clear that cultists have been living in the area for some time since they grew an entire forest, so we can always create our own canon in which they were the “caretakers” of Vader’s castle if you will.