Hey, I’m glad you enjoyed my post! I do like your ideas too. I feel like a lot of people would’ve liked if they had emphasized the spy stuff more than they did in the final film.
I know the sleeper agent Finn is sort of campy, but I do feel like that idea would keep the focus on Finn as a character and see how he confronts his own shadow. I know Nando v Movies did a video where he suggested making Rose the spy, which would’ve be been surprising. Alternatively, you could have it just be DJ.
I do think keeping his story on the Raddus could be less visually interesting, but in ANH, one of the big three set pieces was the Death Star, so having the three set pieces of TLJ be Ach-To, Raddus/Supremacy, and Crait would fit in that frame. And then not being able to jump away makes the feeling of them being trapped more serious. I do like the idea you had of them jumping from planet to planet only for the First Order to show up not long after. It would also allow for the audience to actually see more of the state of the galaxy as well. If you had that idea, and also kept their mission to Canto Bight, I think juxtaposition of the frightened allies being attacked by the First Order and the care-free aristocrats on Crait stand out even more.