MMH5.5 - Heroes of Might and Magic 5.5

Yes it is possible! But it will take me significant time I barely have at the moment.

On the side note with those changes:
1) holly/unholy become mediocre variant of destruction spells
2) Earthquake overlaps with Slow but deals some damage.

But i look it from the MMH55 side so that point of view can be wrong if looking through WGE perspective.

1) Dark is native magic not only for Demons and Undeads, so Unholy Word against only opponents will be useful for other factions
2) Earthquake - when inflict all creatures (including allies), it's much more situational than when inflict only enemies. Analogue of such earthquake is not Slow, but a Swarm of wasps (mass version) - need to be casted each turn, and more effective against low-initiative units.
These are not urgent changes, just noted wishes for the future. It is very good that you already have made earthquake as a combat spell useful not only against walls.