Hello, Valuable project, challenging pursuit.
Years ago but already experienced myself with a long-time homestead I joined
WWOOF in one country of interest, searched out & sorted all the listings of particular interest for research/ exchange, but was in the end unable to carve out the wherewithal to travel.
Now we're on sabbatical as a very experienced family with own homesteads, on the move across a much wider area, & I have primarily searched on this site, through LinkedIn.com, on WorkAway.info, YouTube, & search engines. I haven't yet made workable connections with specific exemplars/ for case studies, due mostly to our constraints as a family plus somewhat the specific requirements/ time frames/ high costs of maturing/ sophisticated sites/ projects of interest.
You might need more time & wider networking. Good hunting!