Forum

The rule of having different hero classes in different slots. Not just at the beginning of the week, but always.

I don't see any specific reason why this rule should be specific to the mirror tavern. The same algorithm applies as for a non-mirror tavern.

But if in SoD/VT you can't even try to do this, then in HoMM the number of heroes has already been increased, and the most complex parts of the mechanisms have already been implemented. There is still a lot of work to be done, but it is manageable.

Well, you might be exaggerating :) I doubt the version matters much here.
The main thing is the desire and the availability of time for a person with sufficient skills. I think you yourself would find it not much more difficult to do for another version.

As for increasing the number of heroes, I understand that the difficulty lies in exceeding the number of 256. If this problem is solved, then in the first approximation, no serious problems are visible. If it weren't for this limitation, then for VT, for example, even the ERM toolkit would be sufficient. At one time, I wrote a script for OH in VT with non-overlapping pools of heroes in the red and blue taverns.