OK, so you are suggesting altering the entire frame rather than just Han himself?
It seems like, the presence of Han aside, he really is in that place. A fly on the wall would still see Ben saying those things and making those motions.
Regardless, I don’t imagine such a thing being an improvement. I like it the way it is without some sort of effect applied.
If you were to go that route, you could do something like Neverar did and have some kind of filter on the scene to have a “dream-like” feel to it. It does not have to be super strong, something subtle could be done maybe?