I have just what you are describing going on right now on my farm in Costa Rica! I just started selling my aged manure (EquiPoo Compost) to other expats with farms down here. It's a great business! I have 2 horses, one donkey and 23 chickens.
From a fellow horse & homesteading family, we were excited to hear what you're up to :) Chickens are awesome. Check out Perma Pastures Billy Bond if you haven't yet.
Great to connect with y’all! Excited to continue sharing the systems we’re putting together to keep our horse management sustainable and effectively improving the land and lives!