[Galin]

•Ost-in-Edhil founded in 750: Around 1350 to 1400, Galadriel deposed by the Gwaith-i-Mirdain and departs to Lorinand

Well, apologies but I must get external with respect to this idea as a given

This ousting of Galadriel comes from a text called Concerning Galadriel and Celeborn in Unfinished Tales, which wasn't finished by JRRT [never mind not being published by him], and contains certain ideas that were revised later [Amroth as Galadriel's son, for instance] and others that in my opinion were arguably abandoned or revised...

... like [again in my opinion] Galadriel as co-founder and co-ruler of Eregion. And thus [if so] there was/would be no need for her to be ousted from power at this point.

Also, Christopher Tolkien thinks The Elessar was probably written at about the same time as Concerning Galadriel and Celeborn, but what came first, this chicken or this egg? And if The Elessar came first, how do we know the circumstances that were imagined behind Galadriel residing in Greenwood when Olorin visited? Christopher Tolkien states that possibly the reference to Galadriel living in Greenwood is related to the refrence in the first edition, in the tale of years of the Second Age, Appendix B:

'... many of the Sindar passed eastward and established realms in the forest far away. The chief of these were Thranduil in the North of Greenwood the Great, and Celeborn in the South of the forest.'

And while much later in the 1960s Tolkien would revise this, for all we know this was why Galadriel, in The Elessar, was living in Greenwood, not that she was imagined as being forced there by Celebrimbor as in CG&C.

There are passages of possible interest with respect to whether or not Tolkien revised the idea of Galadriel as being an ousted ruler in Eregion, considering too, that even Christopher Tolkien raised the question of why, if Galadriel saw through Annatar, she, as a co-ruler with Celeborn in this text, allowed Annatar to remain. These are published in Tolkien's Words, Phrases And Passages, in Parma Eldalamberon:

'... of Angband, many of the Noldor and Sindar went eastwards into Eriador and beyond (Galadriel and Celeborn were the chief examples; but originally the settlement at Eregion under Celebrimbor was also very important.)' entry Yrch

'Also it existed long before Galadriel's coming there -- it was originally ruled by Nandorin princes, and Galadriel and Celeborn only retreated thither after downfall of Eregion.' entry Lothlorien

'... simply Sindarin of Beleriand, brought in by Galadriel and Celeborn, and their followers, who after the destruction of Eregion passed through Moria and established their realm on the east side of the...' entry Sindarin

And when Tolkien revised The Return of the King, for the second edition of The Lord of the Rings, he 'merely' added that Celebrimbor was lord of Eregion (with no reason to think he ruled after anyone), and a Feanorean.

I think that Celebrimbor's change to a Feanorean made him ruler of Eregion from the start, and the former concept of Galadriel being ousted to Lindorinand had vanished [along with the question raised by CJRT]. And if I recall correctly, it was Nerwende who had introduced her son to Lindorinand in the earlier concept, thus giving her a measure of 'family ties' to a place where she could later flee to with the revolt of the Mirdain...

... but again, Amroth as Galadriel's son was certainly abandoned according to Christopher Tolkien, and taken together with the [arguble at least] implication of the descriptions from WPP, what JRRT published about Celebrimbor in the 1960s as well, personally I think this notion was later abandoned.