The second game is also unique because of its imbalance, which allows you to choose one of several different tactics.
Replacing paladins with angels means excluding from the game a tactic designed for relatively rapid development.
Max2009, I don't think a mod that makes the creatures in the second Heroes game equal, thereby killing one of its unique features, will be really in demand. At least among many veterans. And the "youngsters," i.e., those who haven't played Heroes 2 before, will probably not even look at the game itself, let alone a fan-made mod that combines two old parts (as follows from its description).
P.S. well, never mind, it's just a fantasy anyway. No one will want to open and rewrite the game for such additions. Unless someone happens to find an already open source code for Heroes and doesn't feel like bringing the idea to life...
Элементально, Ватсон...