The simplest fix is just to have all ships move into the play area from the board edge instead of having deployment zones. Place the chosen maneuver template with one end touching the edge of the board and continue moving as normal. This would also fix the minor problems with large and huge ship deployment where they are not necessarily completely in the deployment zone at the start of the game.
Now that I think is the first possible fix I have read that might actually work. Still wouldn't prevent falcon or other turret fortressing, but would probably provide enough out of arc lines of approach to any other fortress to completely kill it as a viable tactic.