I updated the download for my flip points tools and added another video specifically for a head turn:
mirror-points-and-flip-mirrored-points-menu-scripts
Basic concept here is speeding up the smart bone creation process for head turns. I found there is at a minimum as few as 2 key frames for the start of any head turn. 3/4 to full side view. That is all you need to do a full head turn. Beyond that, all the rest of the keys are basically the same "data" used in a different way. My initial rough scripts take advantage of that to streamline this process.
Using my flip & mirror points tools for smart bone flipping
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