It was me who removed the plastic dust covers but that was to shoehorn them behind an early mk1 Carver mover. I'm under the impression all Powertouch movers would accommodate shockers?
I would though say 1/2" of clearance from the bracket you say have is excessive, every jobs different but I have perhaps 2mm clearance when in operation, but, the bracket is clear of the tyre when in the off position, in these circumstance I've had no problems?!
What I would suggest is you use a piece of wood 50mm square and 250mm long as a dummy shocker to see what clearance you have, because if that fits a shocker will