NHF – new heroes for Heroes V 3.1.

It's possible. But, I repeat, it looks terrible (see Powder Toy) in the sense that the program isn't designed for that and it's 4MB in size. There are programmers on the forum who can create executables. If not, then, yes, we'll have to do it through Powder Toy.

Added 3 minutes ago
Besides, preliminary unpacking is required.

Added 4 minutes ago
But, in general, you can extract the map, group of portals, and rotation angles, and anything else you want.

But with this program, we can create even more new specializations!

Added 57 seconds ago
And can't we create executables from simple programs in C/Delphi, where we simply unpack, read, change, and repack?

Added 10 minutes ago
And some of them can even read files directly in the archive.

Added 11 minutes ago
That is, the NHFization would take place before launching the game, with a couple of lines added to the map and script names, indicating that it has been done.

Added 11 minutes ago
After all, we need to read and modify text files, where tag conditions are found.