In reply to youwillfindjimbo:
No idea of current snow conditions as it's over 10yrs since I did it, but I do remember the simplest descent was to ab straight off the back and onto the glacier which we did in a couple of abs (2 or 3?) on fixed gear with 60m ropes.
We only carried trainers, which felt a bit naughty whilst abbing down something resembling a mixed winter route, but were fine for the glacier itself at that time.
It looked like scrambling along the top from where Don Quixote finishes would have been a bit of a faff. Not hard, but time consuming, though maybe someone else who's descended that way could say.