Water is already used as a powering mechanism, and it would be relatively trivial to incorporate a windmill into that system. I think the powered cooking mill is currently the only thing that uses it, and I’m not sure how exposed it (and the water wheel used to power it) are (i.e., whether they’re craftable).
They’re currently not :<
But yes, Windmill is definitely easy (and a must)
Ooooh yes please!! Mills rule
I miss that windmill…