My car also has an ignition shutoff problem (no recall, but it's well known). Truth is, if it happens at 80mph on a turn, you're pretty much SOL - your power steering goes. Quick reaction time can let you hit the brakes, which don't need power to work, and if you're lucky you'll be ok. Do-or-die muscles help you turn the wheel without power steering.
My ignition died at 80 on a straightaway. Scary, but despite heavy traffic, I made it just fine. Not only that, but with a half-broken barely functioning ignition, I managed to limp the car from Texas (between San Antonio and Houston) to Boston.
So: you have a very low chance of this happening, and if it happens you have a very low chance of it happening in an utterly terrible situation (turn at high speed).
I'd be much more worried about good old collisions than the ignition failing and causing serious issues. And I have real, honest-to-fuck experiences with precisely this issue.
And if you've done all the recall repairs, any other issues with the car are most likely much less severe. Maybe unreliable, but you should cross that bridge when you come to it - not before.