I dint like the idea of velcro, ochy straps or the expensive 'genuine' attachment device so thought about it for a few days.
What I decided on was a trip to bunnings to buy a couple of 4" bolts; they must have the same thread as the Pocket Wizard's (1/4").
Next step was to attach the bolts via the umbrella slot on my stand.
Then screw the bolt into the threaded section on the rear of the Pocket Wizard, I used a locking nut and washer to help prevent the unit unscrewing.
Once I was happy with the orientation of the Pocket Wizard, I tightened the retainer screw on the umbrella slot.
A low cost solution totalling 50 cents and a bit of time.