Regarding re-instating disfellowshipped people,there has been a leak of a 2024 watchtower that discusses the new light from the annual meeting regarding who will be forgiven.
That talk , was it by Splane??- is all about second guessing God's thought process concerning events such as the destruction of Sodom and if anyone will be resurrected, even though god explicitly stated there was no one worth saving, not even, presumably, babies.
This talk, and also the talk about salvation being possible right up until the end, after the great tribulation has started,seems to set the scene for the possibility to change policies around disfellowshipped ones, and disfellowshipping in general.
As others have pointed out, if there is a mass reinstatement event, I doubt apostates will be invited to the party.