Im game for some friendly exploration of the topic if you are.

While I am a firm believer in immutable rights in the philosophical sense, immutable rights do not and can not exist in the physical/political world. Rights in the physical world are always dependent on the ability and will to exercise force.

I agree that you can establish constitutions which create barriers and make change difficult as long as people are willing to adhere to the governing constitution.

Ultimately, you still need to come up with a purpose of a political system and criteria for discerning a good one from a bad one, no matter what your selected criteria is.