Those are some really cool ideas RL, I would’ve loved to see something like this on the actual film, however I don’t think this would actually work with the material we have available. If things played out the way you put it, then Finn’s plan on Exegol would just lead to the stormtroopers all killing each other instead of Finn actually saving or “leading” anyone, Lando swoops in and saves Finn & Jannah while a ship full of poor unbrainwashed troopers falls into a fiery death.

And then I assume this message also goes out to the other Final Order ships (since it reaches all the First Order ships across the galaxy), which means the whole civilian fleet would also be shooting down ships full of these newly unbrainwashed troopers, killing them all without a second thought.