So, the sock's first incarnation has proved to just be an elaborate swatch.
On starting the patterning my gauge morphed from 7.5 st/inch to 6.5 st/inch. I didn't realize this until I got to the heel, and there was no way to recover at that point. Not so much with the fitting of the sock when it got to the length and the heel. Unless I was making these for someone with very wide, very short feet. Which I'm not.
Ripped it out and rewound the yarn.
Recalculating and will start again in a moment.