That's a pretty good idea... Heck, with some good rotoscoping, you could do better than to just shift the sand color.
I have no idea if it's feasible, audio/video-wise, but that interchange could be shortened to
HAN: I think my eyes are getting better. Instead of a big dark blur, I see a big light blur.
LUKE: There's nothing to see.
HAN: Convenient.
That does leave the "I'll meet you at the rendezvous point on Tatooine." line a little strange, but not unsalvageable.