No to all of this because it doesn't work within the context of a video game.
No developer is going to create a multitude of completely fleshed-out potential starts and backstories because it's impossible and pointless.
The permutations for just one scenario of this scale are massive enough.
What you're proposing would be in development hell for a decade because it's impossible to design.
Also, this belongs in the suggestion forums.
General discussion works too.
Yes, it is alot to ask. Larian will do what they will do.
No, tadpoles arent the only reason everyone is there, pay attention to other npcs.
Avernus escapees. Zhanturim. Drow coming in from underarm. Shadow druids. Take your pick. Its already there.
Larian has already laid the ground work to take it many different directions.
So get over the head in butt approach.
