I have an Oceanic OCi and the wrist sleeve stretches around the computer body so the buttons are easily accessible. My wife's DC is the Oceanic VT4, which is a bit larger than mine and the wrist sleeve will not fit over it. So, watch style, good, puck style, not so much.
Could you not trace the VT4 around the hole that's there and then just cut it a bit bigger? Neoprene is usually pretty good like that.