I'm not sure I understand your point.
This is what I think you are saying:
(1) Religious conservatives are valuable to the GOP. (2) Religious conservatives are more valuable to the GOP than Libertarians. (3) Libertarians are the ones who are opposed to introducing creationism/ID into public school science classes. (4) Because religious conservatives are more valuable as a voting bloc than Libertarians, the GOP should get behind introducing creationism/ID into public school science classes.
Is that an accurate statement of your position?
The only reason I responded to this evo thread (there are so many of them, and they're always the same) is that it is moving out into the "who gets elected" partisan realm rather than the same usual obsessive feedback loop of the Grand Master and his hapless high-fiving legion.
If teachers are really worried about their autonomy (and I don't buy that at all), they can teach evo as a model and not lose a scintilla of their prestige.