Help for the passage. (Fallout 4)

I decided to replay the game in the most humane way
For the Minutemans, especially without touching others if possible.
Last questions:
Spoiler 1) Will it be possible to complete any quests near the Underground and BS after the final video (that is, in a freeplay)
2) Is it possible to save all 13 partners (Dance, Deacon, Institutsky Sint, etc.)
3) Is it possible not blow up the institute?