Basically, you randomly assign counters to groups of figures. Unique individuals get black counters, non-unique groups get white counters. The counters are numbered from 1 upwards. They are shuffled and randomly placed face up beside each unique or group. Then the black counters get to move and act first, in order of their numbers. Then the white counters get to move and act next, in order of their numbers.
There's a few other rules and changes, but it's working great so far, and I'll add more to it as I do it.
Here's a pic showing counters on the table:
and another pic showing the view from the Rebel Platform, at the end of a turn.