Roxy, our Camper & Nicholson 58 has a board. We never use it. It’s weight is inconsequential to righting moment. We draw almost 7 feet up, 13 feet down. It’s pain to maintain, grows it’s own reef in the trunk. Glassing over is a viable option. More than one designer
has stated that these things were a trendy, bad design. I agree. If you were super worried, add keel extension to equal the lost
area but do it along the length of the entire keel.