The person making the appointments is what matters, not the law school they went to. Your blanket statement would have precluded those two from ever serving on the court. Being so doctrinaire isn’t always beneficial.
Sure, Scalia was a fine justice, as is Clearance Thomas.
You are trying to put the wrong spin on this. How do you change the effects of the graduates of these two schools? Make it impossible for them to get on to the District courts, state courts, etc. Make those who want to apply and attend these schools think twice about going there. Then maybe they will change the ideology of the materials they are teaching.
You make a Harvard and Yale law degree a ticket to Juris Doctor obscurity.... lower than going to Podunk State Law School.
You are not going to change the philosophy of the instructors there until it becomes apparent that their graduates will have a hard time securing work in the real world. The Board of Regents needs to be feeling the pinch to their endowments and donations from Alumnus dry up due to the fact that they have not the resources to put into them.
It has to be a blanket “persona non grata” with a Harvard or Yale Law degree.