This blog hasn't much looked in on the prophetic oracles of Joel - directly. It is in CBH excepting six examples of the "LBH" second-Temple cant of the Chronicler. It may or may not cite 'Abd-JehovahObadiah. To this end, John Dunne may offer a helpful project, looking in on the synopsis with Amos (pdf).
Joel looks forward to a new Eden, flowing with wine, focused upon Zion and her Temple. Amos, which is an elder text, has about the same except here the focus is on David's tent. Now: Amos is assuredly a northern text with Amos 6 being in dialect. But "David" as totem shows up in the words of outside opponents: in the north (Dan stele, of Hazael) and against the north (Moab stele, of Mesha). Tents, we should note, are mobile. Also Dunne argues that Amos bears real eyewitness reports of the earthquake in Jeroboam II's time.
We're not really here for Amos. We're just placing him early. He was a popular prophet in the CBH-speaking world, Isaiah and Jeremiah both using his work as to apply to the Jerusalem area. Dunne would add to that list, Joel; as another citer of Amos.
The Old Greek order of Prophets follows that scheme, where Joel "reflects" back on Amos. The MT has rather the order Joel-Amos; so promoting Joel as the prequel, if you like. (Also the Greek merges MT Joel 2+3.) For those who deem 4 Ezra to be originally Hebrew (and based on its connexion with the Pseudo-Philo, I'm one of those): the MT order seems debatable up to Bar Kokhba.
In Old Greek also, Amos himself was interpreted, where David's tent is David's σκηνή which is "built", comparable to Moloch's σκηνή earlier in that book and also to the LXX-Torah tabernacle. In the Greek Tobit 13:10/11 also-also, the Lord has a σκηνή to be "built". I've suspected the Greek project to translate the Prophets was generally a priestly project, in Isaiah's case by exiled dissidents and in Ezekiel's case by Zadokites. Tobit had been composed in the first place by the "Aramaic Levi" crew, which stands to reason would be translated by sympathisers.
Dunne contrasts Joel, Greek-Amos, and Greek-Tobit on the one side; with the late-antique Targum on the other. On the latter side, Amos was still read as referring to David's dynasty. The Damascus Document, in the same lineage as Aramaic Levi and the Zadokite version of Ezekiel, and a citer of Joel 2, takes a third path: that David's tent is now the qahal - soon to become the Qumran yahad community. (On this much, I'll ding Dunne, because his footnote does not support that this be regal
, especially given how equivocally Qumran understands "messianism".)
For Dunne, Joel should be read alongside this Greek priestly translation project before the Damascus Document. Dunne would stick this composition before all of that. Since here he doesn't argue the point, I'll give it a go: it was not "back-"translated from Greek to Hebrew, and it's low in the "LBH". Early second-Temple seems safest, like 2 Isaiah.