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