[FFTA] How can i remove law cards

[Victotem]

Hello,

I am using Darthatron fixed law system through Nightmare, and by removing the rest of the laws i just changed every other existing law to -None-.
The thing is that in order to not allow the player modify the fixed laws i am wasting the 3rd slot to ban: Law Cards.
So, there is a way yo ban the Law Cards other than not allowing them in the Law set?
I tried Ezel's shop editing on Nightmare, but it doens't work even with a clean ROM.