It's a nice explanation and all and I certainly understand what you are saying. Here is the problem with your point of view.
John 9
14 And it was the preparation of the passover, and about the sixth hour: and he saith unto the Jews, Behold your King!
Here is the problem with your view: Because you have started with the premise that whatever you discover
must confirm AD33, you have completely missed the fact that John
completely agrees with the synoptic gospel accounts. So I've traced it for you, introduction Luke, and then tracing it
in John:
Luke 22
1 And the Feast of Unleavened Bread,
which is called the Passover, drew near.
2 And the chief priests and scribes sought how they might kill Him, for they feared the people.
3 And Satan entered into Judas, surnamed Iscariot, being of the number of the Twelve.
4 And going, he talked with the chief priests and captains, how he might betray Him to them.
7 And
the day of the Unleavened Bread came, when the passover must be killed.
8 And He sent Peter and John, saying, Go and prepare the passover for us, so that we may eat.
9 And they said to Him. Where do You desire that we prepare?
NOW LET'S TRACE IT IN JOHN:
John 12
1 Then,
six days before the Passover, Jesus came to Bethany, where Lazarus was (who had died, whom He raised from the dead).
2 Then they made a supper there for Him. And Martha served, but Lazarus was one of those reclining with Him.
12
On the next day, when they heard that Jesus was coming to Jerusalem, a great crowd who had come to the Feast
13 took branches of palm trees and went out to meet Him. And they cried, Hosanna! "Blessed is the King of Israel who comes in the name of the Lord!"
14 And finding an ass colt, Jesus sat on it; as it is written,
15 "Fear not, daughter of Zion; behold, your King comes sitting on the foal of an ass."
John 13
1 And
before the feast of the Passover, when Jesus knew that His hour had come when He should depart out of this world to the Father, having loved His own in the world, He loved them to the end.
2
And when supper had ended, the Devil now having put into the heart of Judas Iscariot the son of Simon to betray Him,
John tells us further down below in the same chapter which supper he is talking about:
18 I do not speak of you all; I know whom I have chosen; but that the Scripture might be fulfilled,
"He who eats bread with me has lifted up his heel against me."
19 From now I tell you before it comes, so that when it happens you may believe that I AM.
25 And lying on Jesus' breast, he said to him, Lord, who is it?
26 Jesus answered,
It is he to whom I shall give the morsel when I have dipped it. And dipping the morsel, He gave it to Judas Iscariot, the son of Simon.
27 And
after the morsel, then Satan entered into him. Then Jesus said to him, What you do, do quickly.
28 But no one reclining knew for what reason He spoke this to him.
29 For some thought, because Judas had the moneybag, that Jesus had said to him, Buy what we have need of for the feast; or that he should give something to the poor.
30
He then, having received the morsel, went out immediately. And it was night.
.. And when supper had ended, the Devil now having put into the heart of Judas Iscariot the son of Simon to betray Him (John 13:2).
31 Then when he had left, Jesus said,
Now the Son of man is glorified, and God is glorified in him.
32 If God is glorified in Him, God shall also glorify Him in Himself, and shall immediately glorify Him.
Then, from John Chapter 13 through 16, Jesus is giving his disciples
final instructions, and final teaching. Then,
in Chapter 16, we read that He says,
John 16
32 Behold, the hour comes, yea,
has now come, that you will be scattered, each man to his own things, and you will leave Me alone. And yet I am not alone, because the Father is with Me.
John 17
1 Jesus spoke these words and lifted up His eyes to Heaven and said,
Father, the hour has come. Glorify Your Son so that Your Son also may glorify You.
John 18
1
Having spoken these words, Jesus went out with His disciples over the winter stream Kidron, where there was a garden. He and His disciples entered into it.
2
And Judas who betrayed Him also knew the place. For Jesus oftentimes went there with His disciples.
3 Then Judas, having received a band and officers from the chief priests and Pharisees, came there
with lanterns and torches and weapons.
4 Then Jesus, knowing all things that were coming upon Him, went out and said to them, Whom do you seek?
5 They answered Him, Jesus of Nazareth. Jesus said to them, I AM! And Judas who betrayed Him also stood with them.
It was after the last Passover meal that Jesus ate with His disciples, the same night. He ate the Passover
after the lamb had been slaughtered at twilight on 14 Nisan, as the law required, and as was the practice of the Jews. The first hours after nightfall was 15 Nisan.
John 18
26 One of the servants of the high priest, being kinsman to him whose ear Peter cut off, said, Did I not see you in the garden with him?
27 Peter then denied again.
And immediately a cock crowed.
What time did the cock crow, do you think?
28 Then they led Jesus from Caiaphas into the praetorium. And it was early. And they did not go into the praetorium,
that they should not be defiled, and that they might eat the Passover.
(Luke 22)
1 And the Feast of Unleavened Bread, which is called the Passover, drew near.
2 And the chief priests and scribes sought how they might kill Him, for they feared the people.
John 18
29 Then Pilate went out to them and said, What charge do you bring against this man?
30 They answered and said to him, If he were not an evildoer, then we would not have delivered him up to you.
38 Pilate said to Him, What is truth? And when he had said this, he went out again to the Jews and said to them, I find no fault in him.
39
But you have a custom that I should release one to you at the Passover. Then do you desire that I release to you the king of the Jews?
40 Then they all cried again, saying, Not this man, but Barabbas! But Barabbas was a robber.
John 19
13 Then when Pilate heard that saying, he brought Jesus out and sat down in the judgment seat at a place called the Pavement (but in the Hebrew, Gabbatha).
14
And it was the preparation of the Passover, and about the sixth hour. And he said to the Jews, Behold your king!
(Luke 22)
1 And the Feast of Unleavened Bread, which is called the Passover, drew near.
2 And the chief priests and scribes sought how they might kill Him, for they feared the people.
John 19
30 Then when Jesus had received the sour wine, He said, It is finished! And He bowed His head and gave up the spirit.
31 Then the Jews,
because it was Preparation, begged Pilate that their legs might be broken,
and that they might be taken away, so that the bodies should not remain on the cross on the sabbath. For that sabbath was a high day.
(Luke 22)
1 And the Feast of Unleavened Bread, which is called the Passover, drew near.
2 And the chief priests and scribes sought how they might kill Him, for they feared the people.
7 And
the day of the Unleavened Bread came, when the passover must be killed.
8 And He sent Peter and John, saying, Go and prepare the passover for us, so that we may eat.
9 And they said to Him. Where do You desire that we prepare?
So as you can see, the problem with your view is that because you have started with the premise that whatever you discover
must confirm AD33, you have completely missed the fact that John
completely agrees with the synoptic gospel accounts.