State legislatures will not pick delegates. According to the 1992 federal law, the states will call special elections to fill those 535 delegate slots.
My point was to the character and calibur of the delegates we might expect. Yes, many states forbid state officeholders from holding convention seats, but not all. What 1992 federal law are you referring to? If it’s the authorizing resolution for the 27th Amendment, then it only applies to that amendment.