Aule, your ideas are perfect. Just make up a name or go with one of the other nazgul. It would still work.
It is what i will actually do, going deeper into character's lore and finding a proper haradrim name
One of the first thing i made at the beginning of the project was actually looking for dark/terrible Harad names, that was before i came up (wrongly
) to the idea of Heromur. But in game it will be unnamed, with only the Title of "The Forsaken".
Garlodur: i read your concept, the one on google drive, it's awesome man! Both you and Filip have done a beautiful job, there's a lot of nice material to discuss!!
I'm not sure about making Khamul the ring hero. But still it seems the most reasonable option. What about connecting the ring function to some dark cult/magic? I would also change the abilities of stadard (no ring) Khamul, in order to contextualize him into the new faction; not simply a copy of the Mordor's one. Maybe we should change his role from building interferer to real supporter for the faction.
I would like to craft also a concept of the Dark Headsman; i'm not only sure if an axe fits for a Nazgul. it seems that this model (from forgeworld/hobbit movie) is the heir of the old GW miniture of The Knight of Umbar (which is better title anyway). At least is what is theorized on fandom wiki. I saw you put some images of him. The Edain team also got the inspiration from GW about Dark Marshall and Shadow Lord.
Finally, in this way you will have Khamul as chieftain plus The Forsaken and Khight of Umbar, as his minor lieutenants to support him. All three once belong to a specific reign of Evil Men faction: Rhun, Harad and Umbar. Each one of the three will have a specific new set of abilities (totally unique with respect to the Mordor's versions) to underline the fact that they're now walking again on their past lands, which give them strength and some of their ancient power as Kings of Men. What do you guys Think?