If there are no plans to replace units in Wintrial, I could help with the translation for this Faction and with balancing the units using a calculator and tests; luckily, I have some free time right now.
Also, since the mod will feature 7 evil and 1 neutral (Conflux) Factions, I suggest coming up with something for the Holy and Unholy Word spells.
Good:
Church (humans)
Sanctuary (nagas)
Neutral:
Dark Gnomes
Elemental Fusion (elementals)
Tatarian Lizards (swamp, lizards)
Evil:
Chimera Mages
Wintrial
Necropolis
I read through the topic a bit and saw that there are plans for a narrative transition from the Ashan that the developers originally planned to the one in which the described Factions exist. I can suggest a narrative twist like a global cataclysm that occurred shortly after the Sareth storyline (you've already discussed its ending and influence a bit, which I think is good): this would make it easier to manipulate the history of the Factions, and the Ashan map could be reworked and we could think about who will live where and where the conflict zones will be (this will be useful if you plan to create stories for the tavern or even a campaign).
Okay, I got a little carried away.
And regarding help... In the Sanctuary Faction, the buildings haven't been translated yet,
so if you want, you can translate them and try to do something like balancing them