The problem is that it's not UVH (which is from Psathi), but specifically UHM – a list of completely different works on creating hero models, affecting all factions except the Dwarves (I couldn't find them).
And when NHF is installed, all characters become generic (except for humans and a couple of others), and UHM doesn't work...
That's why I'm looking for a way to fix this. Unique and interesting models are certainly a good thing, but playing with generic characters isn't very appealing. For example, among the Demons, there are no unique models at all, and that's a shame...