Mordor

The idea is good for a special campaign in Might and Magic. But the units are monotonous – just orcs and ogres; by the way, ogres didn't exist in Might and Magic. There are Uruk-hai (by the way, it seems that this name was used not only for Saruman's orcs, but also for some of Sauron's troops), wolf riders, wargs, werewolves (there is a brief mention of them at the beginning of The Hobbit, where Bilbo says he is ready to go even to the most remote desert and fight them; there are also Beornings, although they are good and transform into bears), giant spiders, undead. From Perumov, you could take Gurrs, Vastaki, Haradrim, Khandish, Umbar pirates, or just bandits. That's how many I've already listed... And there's no need to include Nazgûl (there are only nine of them, unless they are used as a special unit in a limited quantity), orcs, goblins, and trolls, because they already exist. But again, this is if you are creating a race for a specific campaign. But it is unlikely that anyone will do this, and most of the cities that are currently being developed are mostly just talk (developers, don't be offended); only the Russian and naval cities are being developed more or less. Only Bastion has been created, and it will be released when Heroes of Might and Magic 3.59 is released. And you are unlikely to find people to implement this idea, at least make a viable concept. In general, the idea is original; you also need to create my cities: Isengard, Gondor, Rivendell, and Esgaroth. Yes, they are just begging to be included in the game mechanics of Heroes...