Removing the primary weapon bonus outside of arc at R1 would be a good option also. Kind of like ships have done with Dash to stay in his "donut of doom" Soontir and Co. can then flank a turret at R1. Without repercussions.
I like it too. It's simple, elegant, and applies to any ship facing a primary turret, not just the dedicated arc-dodgers. And best of all, it's actually somewhat plausible for FFG to implement it - they did change how range bonuses work in Epic, after all.
A better amendment to the core rules would be on page 11, Step 4, third paragraph. It reads:
"Also, if he is targeted at Range three by the attacker's primary weapon, he rolls one additional defence dice."
Simply add to that paragraph:
"Moreover, if he is targeted outside of the attacker's firing arc by the attacker's primary weapon, he rolls one additional defense dice."
This has a much better chance of removing the disturbance in the force!
Edit: I added the primary weapon the text to the fix. No need to pull anything but Falcons and Decimators into this mix. Frankly, I'd add the same qualifier to Vader crew's ability - has to follow an attack in arc.
Edited by NorseJedi