Removing a high-pitched child's voice from a conversational track

I'm facing an audio restoration issue that goes beyond my skills. I have a recording of a book discussion that was intermittently disrupted by a boisterous kid in the back of the bookstore. I am trying to figure out tools/workflow for minimizing or damping the child's voice, which is quite a lot higher than the two male adults talking in the foreground. I've tried fiddling with it in spectral view with the heal tool, but my results are unusable. This isn't anything I've had to tackle before.

Any advice on how to quiet down that kid? I'm sure he was charming, but he doesn't belong in this recording. I'll attach a short WAV that illustrates what I'm up against. I'm in Audition Mac 2024.

Many thanks in advance!

Edward