Without bringing up PCAccess, I can't remember if there is a Blink Off command available.
If there isn't.
You can try to make a link and program the switch to respond to it with "Last Level".
But the last level may be the blink command.
It's worth a try.
The Omni just sends a reciprocal command at the end of timed events.
So Bright 2 steps, Dim 2 steps or Blink On, Blink Off