I think the idea of hanging cloth panels on the upwind side of your orchid area both to block the wind and to drip water down to provide humidity is the one that will work for you, be cost efficient and not too unsightly either.
Not sure what your supply situation is, but here in the US we have several types of drip irrigation supplies available. I'm thinking something as simple as semi-porous soaker hoses would work. This hose drips water very slowly through the sides of the hose. If you attached jute or burlap panels to the hose then suspended the hose and panels upwind of the orchids, with possibly weight attached to the bottom of the panels to keep them hanging down, that might 'kill two birds with one stone'. It would both cool and humidify the air and also help to deflect or slow down the wind.
