I agree on all counts. And if it is rotated day to day, I hope I picked the right day
I really like Alcest as well, but I have a feeling Anathema will leave me feeling inspired rather than melancholy.
As for the issue of them only playing about an hour, I'm not super concerned. For mine, doors open at 6. Mammifer will probably play almost right away for about 30-40 minutes (done by 7ish). Which leaves about 2 hours for each band, barring serious technical difficulties during the transition. Which would leave it off at about midnight.
At least, that's what I'm hoping for. Fingers crossed.