I found an older quick save and cheated in the camera in the office (cause it was 1 hour before the meeting)"There is a way" - not in game but with cheating with the right flag and variable setting. However, changing the whole path is pretty complex and almost certain to violate your last restriction - it is all but guaranteed that it will mess up your save.
Indeed for this game, certain exceptions notwithstanding, most decisions cannot be reversed without breaking the game even with save file changes or similar.
That did seem to somehow fuck up the couch BJ from Bree.. I get an error saying the " 'person' has no attribute 'id' "
I can ignore it tho and it just keeps going and nothing else seems broken so far so.. eh