Sorry to say that the X2783HSU is too light by almost 5 lbs. You need some sort of ballast to make up the weight difference. I typically recommend our Quick Release Bracket if one just needs to add a pound or so, but in your case that's not nearly enough.
Here's an idea: Maybe build a dual-monitor arm. Get two 24" monitors, our Dual Monitor & Handle Kit, and then attach them to your MX. That would be a pretty slick solution.