Out of curiosity are there any particular preferences for how you dispose of the royal consort and Juanita, possible Adelita as well? I prefer to retain an indirect role in the matters by inducing Agustin to turn against Ines and Juanita and have them both executed. If nothing else, it spares Agustin any grief over their deaths, and at least that much consideration can be made.
If I have to do it myself, I prefer using poison. I will not even consider using the death curse. As for why, it is not exactly the best reason, but I would not have a problem casting the death curses instead if they did not call for one to murder a dozen black kittens each time and use their blood. I love cats, so I cannot bring myself to use that option. That is curious. I will not hesitate to have Ines and Juanita killed, but I still balk at killing kittens. Without casting death curses, I can still get my Magic up to 90, which is good enough.