[_hnwo]

Not sure if this was mentioned already but Kali Linux includes a patch for cryptsetup that essentially does this - provide a certain passphrase and it nukes the keyslots, effectively making the data irrecoverable.

https://www.kali.org/tutorials/emergency-self-destruction-lu... and tutorial for use at https://www.kali.org/tutorials/nuke-kali-linux-luks/

and the patch on github;

https://github.com/offensive-security/cryptsetup-nuke-keys