I've never seen that done on a sailboat but it seems like a valid idea for a swing centerboard like the Starwind has.
My swing keel is steel and it's very handy that I don't have to worry overly much about scraping it on the bottom, so long as it's not actual embedded rocks. When I did my acceptance ride with the dealer he made a point of beaching the boat on the keel so I could see that it's not a problem. You're still going to want to avoid actual embedded rocks but you'll be able to safely maneuver in shallower waters with gravel, sand, or mud bottoms.
I regularly launch in a river that is quite shallow at low tide and I strike the mud on a pretty regular basis. Club members with fixed keels pretty much have to stay at the dock during those times, especially when the tide is going out. Having a more robust swing keel or centerboard is one of the many advantages of trailer sailers over conventional sailboats, so why not exploit that advantage?
You'll want to be careful to fair it in so that you don't spoil the hydrodynamics of the leading edge. If you create a leading edge stall or vortex bubble it will hurt your leeway performance. But, most likely, there wasn't much science behind the shape of the original centerboard so, as long as you do a good job of it, it probably won't hurt performance. Heck, you might even improve leeway performance.