I don't think I've ever seen one for a sedan. I thought in order to get to the rear towers was to take apart the entire rear deck and rear seats. I assume that there is a front sway bar.
Since the things you mentioned about safety and other factors when replacing the oem rear sway bars with aftermarket rear sway bars, I think it be much easier to just add on the front tower brace.
I'm not planning on lowering the car since I think it's low enough with the stock height!! The new 09-11 corollas look much higher than previous models and look much higher than mine!!