Well, I just have much more sympathy for someone who was indoctrinated and forced to join a fascist army, while I have very little sympathy for someone who joined a fascist army by choice. In the former option, they aren’t bad at heart, they were just brainwashed. In the latter option, most of them would have to be really bad in order to willingly sign up for this. It’s not really the same in my opinion.

Here’s all the things we would need to change in order to do this, from what I can tell:

Cut Finn saying that his only name is FN-2187, replace with audio of him saying “I’m Finn.”
Cut Phasma looking at a picture of Finn as a kid and talking about his indoctrination process.
Cut Finn saying that he was taken from a family he’ll never know and raised to fight.
Cut Finn telling Phasma his new name (most edits cut this scene due to excessive comedy anyways).
Cut the First Order officer talking about harvesting the galaxy’s young.
Cut Jannah talking about being conscripted as a kid, possibly inserting the Falcon cockpit bit to cover up the position change.

I think it could definitely be possible, and wouldn’t affect the runtime very much.