Have a heavy cloth bag at each table. The balls are placed in the bag and the racker reaches in and pulls the balls out one by one. The balls are placed in a preset order, (I.e., left to right, back to front) in the rack. The only exceptions are the one and nine. They have 20 seconds to get the balls out and place them in the rack. They then have 10 seconds to set the rack.
Here is a match from a tournament that tried something new to avoid pattern racking, but one of these players didn't exactly follow the rules. Fortunately, that one didn't win.
They were supposed to shuffle the balls, push them against the rail in a single line and then rack from the ends, ie. the first 2 end balls behind the one, the next 2 end balls next to the 10 ball, then the last 4 behind the 10.