Didn't you, knowing that there are such skilled people with the source code, bother to ask them about the possibility of properly writing the code for a new faction? ))) or does it just seem that the new faction isn't really needed by anyone? )))
I had the idea to do disassembly (it can be done without problems for 3.1 (Ubi, Nival, and Buka), for example, using IDA), but without the source code for 3.0, and possibly with his comments, it would be a Sisyphean task... well, and based on the two listings, a combined cross-analysis of code matching would be done!
Therefore, this idea about new additional factions needs to be brought to Magnomanus collectively through the respected Dredknight, so that it would be really great to increase the number of factions!

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1