Let me dumb it down a little.

If you, as an AST, demand that I not use any shields after the opener while I'm playing my SCH, I'm going to laugh at you. You'd essentially be telling me not to do a pretty crucial part of my job because you want to, despite the fact that you can click a button and let us both do something beneficial to the group without overwriting one another and wasting MP.

That's kind of the end of the line. There is no tactic which would make a Noct sect anything but terrible to pair with a SCH, especially because you have Diurnal to use instead.