Great idea ! I lived in Beneficio quite often (and even paid to buy the land with other people from my "tribe"); there might still be land to buy near Orgiva, as country people were leaving (Lanjaron, for example); cold in winter, though . Canarias might be better (just a suggestion !): mainly Fuerteventura, which is not yet invaded by tourists and cheaper; 23 degrees all year long…, though more difficult for growing food (dry land !) and farther from England, Germany , France… !
I am sure that a lot of people will be intersted in your plan; I am … and so are a lot of my friends (which are all "rainbow" people and have already lived in communes). It might be intersting to put your mail on the French rainbow forum. Shall I do it or will you ?
The very best to you !