So sorry to hear about the Xylella Fastidiosa. I had heard that it had landed in Spain from Brazil in your area and have been searching the internet for anyone who has successfully treated it using compost tea. I did find reference to a vineyard in California. I've also watched a lot of Elaine Ingham's videos and she says that with 70 to 100% coverage with compost tea you can beat most diseases, so long as the compost tea has all the biology required.
And she also gives me a lot of hope in that even if you do have to spray with the toxic chemicals, you can recover the biology very quickly if you have access to a quality compost tea. Maybe you have someone in the area that makes it.
I haven't started composting yet, that's next on my list (permaculture certainly is a steep learning curve) but I do have a small amount of worm compost.
Good luck with the food forest, I'm focusing initially on support species and found a great site http://dolcarevolucio.cat/botiga/gb/53-seeds-of-medicinal-plants?id_category=53&n=304
that has some really interesting tree seeds. Although I haven't yet found a source for tagasaste - citisus proliferus a nitrogen fixer native of the Canary Islands. I haven't had much luck raising seeds so far, so fingers crossed!
This year we want to build a rammed earth 'root cellar' food storage and preparation as a ring dam design which seems to be the cheapest and quickest way. It's just too hot or too cold to stay in the caravan (it's very old) and so we are living in the village which is not ideal.
Thank you for your kind invitation, I will let you know when I plan to be in the area. Also, if you have any questions or would like to remain in contact, my mobile number is 654 32 07 35. David has green fingers when it comes to computers and although he hasn't worked specifically with Wordpress, he has designed and set up a number of websites, so do let us know what the problem is, maybe he can help.
There is also a new FB page called living off the grid in Spain run by Sandrine from Belgium who lives just a bit to the north of me in Aragon. She has alpacas!
Good luck with all your projects.
Lucy and David