I edit VARs a lot, especially removing things in them that I don't want and in that way save space. However, any alteration to the original VARs will bring its own problems. For example, you remove something in X VAR that Y scene needs, then even though you have the X dependency VAR, the Y scene will give errors if what you removed was needed for the scene.
If your only goal is to save space, looks tend to be the ones that take most space compared to the other resources and you probably have many. Maybe get rid of some you don't want.