Just a small warning: The clipper in Stereo Tool is not (yet?) C-QUAM compliant. It shouldn't be too difficult to make it compliant though.
Processing L+R and L-R (where apparently L-R shouldn't have asymmetrical processing???) is easy enough, but L and R themselves also need to be protected to avoid distortion in a receiver in some situations, which makes things a bit more difficult.
Breakaway is, though I'm not exactly sure how. Haven't looked into AMAX standards yet. It sounds fine enough for now as you can hear in the samples. I at least have an AM-friendly HPF setting, as well as asymmetrical clipping. Natural Dynamics helps a ton too. Though, I'm somewhat bummed to not be able to use pre-emphasis. Can it be done somehow?