Thanks to the notice of a friend of Garabide we have learned about this resource on the Living Tongues website. This is what you can read on its website:
"If you want to learn an endangered language online, where do you begin? We are pleased to address this topic in our latest resource, “Learn Languages Online: A Guide To Studying Indigenous, Under-Resourced and Minority Languages.”
We have thought that it could be of your interest, so we have collected the complete guide in pdf in the "documents" section of our website. To read and download the complete guide for free, just press the word "see" below.