I’m glad people like the gas idea!
It would require some VFX work to sell the idea. I made a quick mockup to show how it might look in action:

https://vimeo.com/241122910
Password: gas

I’d prefer a bit more swirling and eddying gas in the first panning shot, so that Boushh is basically wading through it and can hardly see a thing. This makes her bumping into the chimes a lot more believable. Then it could stay quite dark and gassy until the shot of Han in carbonite, where the gas starts clearing dramatically.