A Few questions on modding

[Sombre]

You could put them all in the holy school, then they wouldn't be on the research lists, although when someone with holy magic tried to cast a ritual they might all be on that list, which wouldn't be ideal.

Or you could give them the school of -1 which is 'cannot be researched' - I think that removes them from the game, but it might not. Give it a try.

The game spell AI seems to cope with new spells,.. sort of. I have no idea what would happen if you replaced all the spells. My guess is it would be ok though.