Luke 22-24 proves that the kingdom of God is the Savior Himself, who was among the Pharisees when He was questioned by them. Wherever the Savior is, there the kingdom of God is. The kingdom of God is with Him, and He brings it to His disciples. He is the seed of the kingdom of God to be sown into God's chosen people to develop into God's ruling realm. Since His resurrection He has been within His believers. hence the kingdom of God is within the church today (Rom. 14:17.) The "kingdom of the heavens" is where "the heavens do rule (Dan. 4:26)."

"One in purpose and agency" is a JW interpretation. The Greek word is "heis" which just means "one." Rather than trying to twist the Scripture to fit what makes sense to you to try to figure how to avoid violating the laws of physics, it would be better to pray that the Spirit would enlighten you about WHAT IT MEANS that they are one. They are Spiritual, not physical.