Slow progress to report, but progress! After much to-ing & fro-ing, I think I've found a compromise which adapts the first part of my overly long outline as a separate piece, with a few key changes. Not certain quite how it plays out yet, but I think it will work out. I've also reread my source novel taking character notes, and even started to put a few rough scribbles down on paper (not yet typed up) for the opening scene.

Going to bed now. Will try to catch up with other people's progress tomorrow.