Assuming you have correctly topped off your carboy to reduce the headspace, you will not have room for the finishing blend. I would add the finishing blend to a sanitized carboy, then rack your wine into the new carboy. You may end up with some extra wine, I would drink it to see what it tastes like.
Also I would add a half dose of Kmeta, assuming you added a full dose of Kmeta at your last racking.