Given the cost of the switches, personally, I wouldn't attempt what you're suggesting. That's aside from the fact that the only way a coupler works is to...well...couple the two legs of your 110 volt service in your condo. If you look at your circuit box, there are two verticle main power lines coming in to the top of the box. Every other breaker in the box works off one of these two lines (for example, on each side, breakers 1,3,5,7,9 etc. work off one of the lines, and breakers 2,4,6,8, etc. work off the other line). Those items in your house, like some ovens, that are 220 volt have a double breaker that runs off of both 110 volt lines, hence the 220. For what you are suggesting to work, you have to tap into both of those lines. Not being an electrician, I personally wouldn't mess with it, and I'm very comfortable working around electricity.

Just my thoughts.