I wrote it in the OP. And no, you have to settle the overall plot direction from the beginning and change the details for the characters or it might lead to nowhere, I've tried it before.
I did, SI is cunning and dirty, SW is strong and wanted to prove her strength. BH is cold but she had her discipline, would not betray her employer unless they betray her first or do unnecessary killings.
The problem is just about Satele Shan but we just put it away, she would sacrifice herself for her son right? Let's start from her capture.
ok, I have to wash my hands of this now. You're just making up huge things with major characters and....well, you're going to do what you're going to do.