I believing they are Israelites like the passage says. I do not allegoricalize that away. But a multitude from the nations come out of the great tribulation. I'm not sure when the 'fullness of the Gentiles' is complete-- maybe during this time period or at the end of it.
Israel shall be saved out of it, not from it.
Jeremiah 30
3 For, lo, the days come, saith the Lord, that I will bring again the captivity of
my people Israel and Judah, saith the Lord: and I will cause them to return to the land that I gave to their fathers, and they shall possess it.
4 And these are the words that the Lord spake
concerning Israel and concerning Judah.
5 For thus saith the Lord; We have heard a voice of trembling, of fear, and not of peace.
6 Ask ye now, and see whether a man doth travail with child? wherefore do I see every man with his hands on his loins, as a woman in travail, and all faces are turned into paleness?
7 Alas!
for that day is great, so that none is like it:
it is even the time of Jacob's trouble, but
he shall be saved out of it.
That day, the time of Jacob’s trouble, is a day of wrath.
Zephaniah 1
14 The great day of the Lord is near, it is near, and hasteth greatly, even the voice of the day of the Lord: the mighty man shall cry there bitterly.
15
That day is a day of wrath, a day of trouble and distress, a day of wasteness and desolation, a day of darkness and gloominess, a day of clouds and thick darkness,
The Church is not appointed for this time of wrath, the time of Jacob’s trouble. The Church has obtained salvation through Jesus Christ.
1 Thessalonians 5:9
For God hath not appointed us to wrath, but to obtain salvation by our Lord Jesus Christ,