2. Those talking points need to follow a progression from as in other cases to  Article 1, Section 15 "The right of trial by jury shall remain inviolate.  The legislature shall pass such laws as may be needed to regulate the same, and to maintain it's purity and efficiency"

Jury nullification is a consequence of a trial by jury, "for the courts cannot search the minds of the jurors to find the basis upon which they judge."

Your point of contention will ultimately be with the Code of Criminal Procedures Title I, Article 36.13.

"Jury is judge of facts.  Unless otherwise provided in this Code, the jury is the exclusive judge of the facts, but it is bound to receive the law from the court and be governed thereby."

The counter to this is again to return to the Texas Constitution, Article I, Section 29.

"To guard against transgressions of the high powers herein delegated, we declare everything in this "Bill of Rights" is excepted out of the general powers of government and shall forever remain inviolate, and all laws contrary thereto, or to the following provisions shall be void."

Article 36.13 is in direct contradiction of Article I Section 15 as it does anything but maintain the purity of the trial by jury.