Things are slowly opening up.
Attended a 2 day retreat with Lama Glenn Mullin, this last weekend, and he did a creditable job of teaching all the 6 yogas of Niguma which, while not Dzogchen, helped to clarify many of the secondary practices of Dzogchen.
I strongly recommend Lama Glenn as an excellent Tantric teacher. (He may know Dzogchen also, but I have not heard these teachings from him.)
http://www.glennmullin.com/new/index.php
This afternoon I found a webcast of Fabio teaching Khumbaka on the DC Webcast site and it was very helpful. Before today, I believe, Khumbaka had always been presented as a closed retreat subject within the world of Dzogchen secondary practices. Nice that Fabio felt to teach Khumbaka in an open webcast. Nice that the IG permitted this.
Perhaps in the future it will be possible to receive all of the Dzogchen secondary practice instructions on the web, for free, with appropriate reading lungs from lineage holders.
A Dzogchen Master will always be required to give the pointing out, direct introduction, on or off the web.