http://2010.archive.hobiecat.com/media/pdf/euro_wings.pdfCheck out the 2 Euro wing ideas. There is some merit to there simple design. Could improve upon the idea.
In regards to the concern of snuffing bows or over taxing the rig, maybe simple wings like these are the happy medium. Probably not too expensive to try and fabricate as well compared to new beams and rigging.
One thing I've thought is if I stay with stock width the windward hull can get out of the water quicker thus improving speed. Widening the boat means it will take more wind to get the windward hull out of the water. You are stuck with that width and righting moment. Wings,
built light and engineered, allow weight to be moved from edge of hulls to as far as 2' away (wider)from the side of the boat. Improved hiking.
When I had my 18 sq, there were many times when other boats on the lake espcially newer, modern cats could fly a hull sooner. It wasn't until the wind was cranking that my 11' width became an advantage.( Also I have to admit it was an old Nacra Sq and not exactly light by todays standards)
The goal is to safely single hand this boat and be competative in a handicap fleet in most wind conditions. If its an 18 sq great or just races to a number fine.
Thanks to all for the feedback thus far! Keep the thoughts and opinions coming.