No way a windlass would fit. I own a 216 (and I'm the Service Manager at a Grady White dealership). Just buy a Fortress FX-7 anchor. It weighs only 4 lbs, has amazing holding power, and is easy to retrieve by hand.
Yea kinda like putting a thruster on a 23' boat... Not needed, costly and if it doesn't fit it's an easy decision. If it fit, I'm sure GW would option it.