Adam and Eve had no one to witness to in Eden, but anyway I'm not really into time travel. A number of features of Eden are carried forward to Revelation, but not all. The point I was alluding to was that sin will have been dealt with and the situation will have been restored to one that was similar to that before the Fall.
Literal Kingdoms need literal kings and literal thrones. With reference to Jacob's family, there aren't either in Genesis.
Saul, David and Solomon were literal kings literally reigning from Jerusalem over one literal nation.
After that we have literal kings of Judah in Jerusalem, and literal Kings of Israel in Israel.
After Assyria and Babylon, there have been no literal kings of Judah/Israel reigning on any literal thrones. Nor would there be until the Kingdom of Christ to be set up at the second coming:
Eze 21:26 Thus saith the Lord GOD; Remove the diadem, and take off the crown: this shall not be the same: exalt him that is low, and abase him that is high.
Eze 21:27 I will overturn, overturn, overturn, it: and it shall be no more, until he come whose right it is; and I will give it him.
That I believe will be a literal fulfilment after Christ has returned - the literal political kingdom the Jews always anticipated.
Luk 1:32 He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David:
Luk 1:33 And he shall reign over the house of Jacob for ever; and of his kingdom there shall be no end.
Then it will be Psalm 2 and Psalm 110, not the Gospels and Acts when the king and his apostolic witnesses were persecuted and put to death.
And when Israel submit to the righteous rule of Christ, the nation of Israel will again be the head and not the tail, as Moses promised and as they achieved to some considerable extent under David and Solomon:
Deu 28:13 And the LORD shall make thee the head, and not the tail; and thou shalt be above only, and thou shalt not be beneath; if that thou hearken unto the commandments of the LORD thy God, which I command thee this day, to observe and to do them:
Deu 28:14 And thou shalt not go aside from any of the words which I command thee this day, to the right hand, or to the left, to go after other gods to serve them.
when asked about restoring the Kingdom to Israel, He said, "You shall be my witnesses..." then proceeds to name the capitals and regions wherein the house of Judah and the house of Israel were.... hmmmm.
I think it might help to have a closer look at that...
Act 1:6 When they therefore were come together, they asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel?
Act 1:7 And he said unto them,
It is not for you to know the times or the seasons, which the Father hath put in his own power.
and then after that he revealed
what they were to know instead:
Act 1:8 But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.
And that is also a breakdown of the apostles' witness indexing the Book of Acts in order, again with no literal thrones or kingdoms - Israel was under foreign dominion for every minute of that period.
The Gospels and Acts document the execution of the king and several of his witnesses and culminates in the expulsion of the nation of Israel from their land just a few years later in AD7o.
That is nothing like the kingdom that I expect from prophecy.