So you would need to edit KAVA's texture files so that it matches whatever it needs to be matched to fit UAVA's? That's too bad, I though they would be a perfect fit. I mean, they probably got the same name, and for efficiency I though they'd be the same, just with an increased resolution.
And about the texture files' size, you could probably compress 8 gigs into about 5 gigs. A few week ago I sent my UAVA folder to a clan mate via private torrent, and I got it compressed from +/-5.5 gigs into a 2.96 gigs. What are 5GB of seeding in 2013
EDIT: I guess you could send just 1 or 2 textures to see if it is actually possible.