I think I made a mistake

[Grotesque]

Of course it means you have to get 75 Alexandrites and the Materia again but it is up to you to change what you have initially chosen.

Wrong, this is totally wrong. You only need alex and materia for what you want to reset. If you want to reset 2 points, you need 2 alex and two metaria, thats it. Even if your novus is bugged now you can relatively easy change it to what you want.