NHF – new heroes for Heroes V 3.1.

The problem is that right now, it's impossible to get the names of garrisons, or is it?

Yes. If you combine the mod with NCF, you can create hero specializations that change the parameters of creatures.
Garrison type - hero. Mines - monster.
What needs to be done to make garrisons display names? Change their type?
When you set the garrison type for a mine, it returns the name based on the type.

Added after 17 hours 28 minutes
Maybe there's another way to intercept all events right before the battle?