While there are verses such as Jer. 2:1-2 that likens the people's early relationship with Yehovah (the Father) to an espousal period, The Lamb's Bride is most clearly New Jerusalem, as per Rev. 21:9 (KJV):
And there came unto me one of the seven angels which had the seven
vials full of the seven last plagues, and talked with me, saying, Come
hither, I will shew thee the bride, the Lamb's wife.
In Matt. 9:15 (KJV), Jesus says his disciples are the children of the bridal chamber:
And Jesus said unto them, Can the children of the bride chamber mourn,
as long as the bridegroom is with them? but the days will come, when
the bridegroom shall be taken from them, and then shall they fast.
John the Baptist himself identifies as a friend of the groom, but not as part of the Bride:
John 3:29 (KJV) He that hath the bride is the bridegroom: but the
friend of the bridegroom, which standeth and heareth him, rejoiceth
greatly because of the bridegroom's voice: this my joy therefore is
fulfilled.
Now, could the fact that "all men come unto him" indicate that "all men" are 'the Bride'? Or could in be a location, much as New Jerusalem is a location, so to speak?
John and Jesus are clearly in different locations at this point:
John 3:22-23 KJV After these things came Jesus and his disciples into
the land of Judaea; and there he tarried with them, and baptized. And
John also was baptizing in AEnon near to Salim, because there was much
water there: and they came, and were baptized.
Jesus is is Judaea, which I contend is the Bride he is speaking of here, i.e. John is standing outside of Judea on the other side of Jordon. Geographically, he is standing just outside of Judah and hearing the report, i.e. 'the voice' of the bridegroom who is filling the land with reports of his miracles.
To go into all the OT prophecies that liken the Land of Israel and Jerusalem to a spouse would take up a lot of space. Here's the one quoted in the question:
Ez. 16:1;8 Again the word of Yehovah came unto me, saying, Son of man, cause
Jerusalem to know her abominations...
Now when I passed by thee, and looked upon thee, behold, thy time was
the time of love; and I spread my skirt over thee, and covered thy
nakedness: yea, I sware unto thee, and entered into a covenant with
thee, saith the Lord GOD, and thou becamest mine.
Even Hosea says,
"Go, take unto thee a wife of whoredoms and children of whoredoms: for
the land hath committed great whoredom, departing from the LORD."
Hos. 1:2 KJV
So it is the land and Jerusalem that are likened to a Bride, not the people themselves. The children God begets of Jerusalem and the Land are the generations that would worship there and will worship there. These are the children of the bride chamber, not the bride herself. The intimacy that the children of Israel will have with God, who is their Father, will be mediated through this city, who is in a sense their mother:
Gal. 4:26 (KJV) But Jerusalem which is above is free, which is the mother of us all.
In the New Testament, Paul refers metaphorically to the Conrinthian congregation as a virgin he espoused to Christ, but this is the individual congregation, not to one collective Bride-Church:
2 Cor. 11:2 For I am jealous over you with godly jealousy: for I have espoused you to one husband, that I may present you as a chaste virgin to Christ.
The key here is 'as', and we're not even sure this means 'to marry Christ' or if the 'one husband' is in fact referring to Paul's presentation of the gospel. I.e. he's saying he hasn't taught them different doctrines, but a consistent one (one husband/man) so they would not be beguiled by false teachings. Why would he have to espouse to one husband in order to present her as a chaste virgin to Christ? The only answer is that the 'one husband' is the real gospel. Then, the future presentation of said virgin congregation would be in keeping with the wise virgins who are granted entranced into the marriage supper (they are not the Bride).
This metaphor Paul uses also conjures up the confusion that could occur if a girl became espoused then had second thoughts. I believe Paul uses this metaphor to drive home a point. Any father who had ever betrothed his daughter to a husband could understand how many problems another suitor could cause. This is why Paul uses the metaphor in relation to the true Jesus he's communicated to them, not because he's saying Jesus is going to wed every church, or every church is a spiritual bride.
The 10 virgins parable in Matt. 25 likens the wise and watchful believers not to the Bride, but to guests at the wedding banquet who are permitted to draw near to the bridal chamber for the festivities, which in ancient times included a celebration of the marriage's consummation. This business of "hearing his voice" is pertaining to the custom of the groom's friend waiting outside the bride chamber to receive the garment that was proof of the virgin's purity, etc., after intercourse.
We do have an address to a 'chosen lady' in 2 John, but this is likely to be a person named Cyria:
2 John 1 (BSB) The elder, To the chosen lady and her children, whom I love in the truth--and not I alone, but also all who know the truth--
[Thayer's Greek Lexicon]has this entry on the work 'lady' or 'Cyria', 1κυρία, κυρίας, ἡ, Cyria, a Christian woman to whom the Second Epistle of John is addressed.
I think the personal nature of 2 John backs that up, as does the fact that he says this in verse 12 (KJV):
but I trust to come unto you, and speak face to face, that our joy may
be full
So, the usurpation of the Bride Jerusalem by the false Bride the Church of Rome was induced by interpreting the Church itself to be the only Bride of God there could possibly be.
However, New Jerusalem is the Lamb's pure Bride, prepared from the foundation of the world, containing the garden of Eden and the Tree of Life. During the 1000 years reign on earth, we will prepare for that wedding in a kind of special rehearsal in Jerusalem, preparing our garments for this:
Rev. 19:8-9 She was given clothing of fine linen, linen bright and pure.” For the fine linen she wears is the righteous acts of the saints. Then the
angel told me to write, “Blessed are those who are invited to the
marriage supper of the Lamb.’” And he said to me, “These are the true
words of God.”