Connected the Vox to my PC and formatted the drive with the Vox on USB transfer mode.
Turns out the Vox has a safe partition where the factory image resides, and blanking the main partition on boot prompts the image to get copied. So a primary SD format and factory default will zero the device.
So for any others trying the same thing: do what I described, or what hieronymos advises -- this is how one performs an actual 'drive zeroing' / factory default.
Cheers,
-WM
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