Today's "duh" moment: turns out you can use any switching buck converter as a voltage inverter by just swapping Vout and GND.
Replying to @scanlime
Yeah, it's a thing. http://www.ti.com/lit/an/slva317b/slva317b.pdf … https://www.maximintegrated.com/en/app-notes/index.mvp/id/3844 …
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