Doing that though invaldates shields. If handling just equals automatic defense that is better than shields, it really just doesn't seem right. Which is why I would rather encorporate it into Evasive Manuevers (more maneuverable ships are harder to hit when going evasive) and scale it more to starfighter shield levels (0-2 setback dice).
And really, a couple more advantage spending options for GtA and a small boost to Evasive Maneuvers is still less info than tracking every ships speed.
Though if you want to give it less charts and stuff to remember, you can just make a starship quality:
Evasive (Ranked): This ship adds 1 setback dice per rank to all attacks made against it when under the effects of Evasive Maneuvers. This quality cannot stack with itself.
Then add Evasive I to all ships with +1-+2 handling, and Evasive II to all ships with +3 handling.
Edited by Emperor Norton