Modding

Hello everyone. I think many of you know that for years the community has been trying to add new factions to Heroes V without replacing the original ones. But due to the engine's limit of 8 factions, a fully-fledged new faction cannot be created, leaving only the option of replacing one of the existing ones.
But now neural networks and all sorts of cool, awesome, mind-blowing, stunning, amazing things have developed. In particular, just a few days ago, a Universal Modder for Claude appeared that allows exploring game EXEs and assisting with modifying the engine itself.
So here's the question: is it theoretically possible now to bypass the 8-faction limit and add a fully-fledged 9th faction without replacing the originals? For example, hypothetical nagas with their own town, creatures, heroes, etc.
Or is the limit so deeply embedded in the engine that even with modern tools it's still not feasible?