Good idea. Since we grow most of our orchids in a greenhouse here, I do not worry too much about moisture as long as I water once a week during the winter and twice a week during the warmer months. (Some orchids do not get much water at all during their needed dry period over the winter). The orchids I grow in our small indoor orchidiarium I must keep the humidity up around them and it is difficult. I use a humidity gauge as well as a small waterfall fountain and a large glass vase with a fish tank bubbler in it to keep the humidity higher than in the house. I believe you are on the right track.
cheers,
BD