Why not stitch together the two scenes before and after they call Maz into one? I wish I had the script, but there should be enough there to show they need a specific codebreaker, and if you cut canto bight entirely, you don’t need to explain why they need to go there.
Finn: "No one can get in there, they scramble the shields code every hour."
Poe: “I think I know someone.”Cut to Finn and Rose leaving on the shuttle. That’s all you need.
It’s all about the dialogue. I recall him just lifting his head up and then we cut to maz but if he says “I think I know someone” then you can cut straight from there to the radar blip and then you see them pick up Poe’s call on the ship that they found a code breaker. And then you have the scene of him stealing from the ship after that before they arrive at the supremacy. You could also cut down them sneaking around (iron joke, evil BB-8, jokes).
Good thinking Handman, I think that’s the best way I’ve heard yet to cut down Canto Bight.