GrumblingVomit here, developer of an Esroniet mod (https://www.nexusmods.com/morrowind/mods/47929). I made this before I even knew that there was a planned Esroniet mod back in 2018, so no ill-will or claim-jumping was intended.

The mod has been made, still updating it, but I don't think it is too far along to make a course-correction to align with the lore of Tamriel Rebuilt. Only lore decision I made was to put the Kothringi there because they are mentioned in Oblivion and the race of the inhabitants of Esroniet is not mentioned, so it seemed plausible that a group of them could have sailed over from Black Marsh, Bashomon sounds like it could be a Kothringi name, etc.

I searched around on the forums, but I didn't see too much mention of Esroniet. So, question is, what do I need to add/change to bring Esroniet in line with Tamriel Rebuilt's lore? When I first started developing it, I felt that my skills were not good enough to apply to join the TR team, but I'd certainly like to work to get it included under the Tamriel Rebuilt umbrella if there is a desire for it.