Guyod-
There is a relatively easy way to do a 3 way wireless switch and we do it here in Salt lake once a week or so on different properties. There is a switch made by enocean that will control a receiver from around 100 feet. the cool part is the switch doesn't need batteries or wires, it powers itself with some crazy german engineering. we get ours from
www.enoceanwireless.com but there are several places that sell them. they work great for lathe and plaster set-ups