Why would they ask if Jesus was going to establish His kingdom if they had already seen Him in His kingdom?This may have added impetus to their hope that the coming of God’s kingdom was immanent, as they asked Jesus, as he was ascending to heaven, if he was going to establish his kingdom at that time? (Acts 1:6)
I think you are trying to have your cake and eat it. Either Jesus was in His Kingdom or He was not in His Kingdom and if He was not, then it is just another failed prophecy by Jesus.