UPDATE: Obviously, patience won the day. After letting it soak for a while in alcohol and working the lens a bit more, the little bugger has come free. I'm facing an evening with cotton swabs and toothpicks to get all the nasty stuff out of the crevices, but I'm over the moon that a project actually worked with little more than a couple of cuts.
My God is the SM-9 a nice machine. My fingers have a post-coital smile. Using this Dell keyboard afterwards is like a cold, wet washcloth to the face after that.