I have no clue about modding, but I am thinking how close FE can be made into MOM. Let's leave aside the actual spells & talk systems.

MOM is of course totally magic focused so there is no researching of technology, all improvements are set by the race you play etc. You only research spells..

The closest I can figure is

1. Alter fractions to have city improvements already researched at start of game (keyed to factions so some factions would have some city improvements and warfare techs others would be diff??).

2. Remove all other trees from civics/warfare (or already have the appropriate techs researched and remove the rest) except the magic tree. 

3. Spell tree would be listing singular spells for each research node. So no book of winds.. but "book of regeneration", "book of fireball", I am not sure if is possible to move spells that currently dont need research to become researchable.

I doubt is possible to simulate the whole Power divided into Mana/Research/Skill system. Or the skill system for that matter.

And also the whole system where what spell picks you choose at the start determine heavily what spells you can research.

modders what say you?