After a few days, the seeds germinated in the window. They're still quite small, but I think I've waited too long anyway.
I have no experience in using coco or in drip, this is my first trial.
So far, 4 helmet heads have emerged from a total of 8 seeds: 3 Haze berries & 1 Amnesia haze.
(There was also a Dos Si Dos Auto and two Dance World strain which didn't germinate).