The legal situation is more complex and nuanced than the headline implies, so the article is worth reading. This adds another ruling to the confusing case history regarding forced biometric unlocking.
Enter pin
“I don’t know what happened, it’s the right code, might be broken.”
That pin was device self sanitiziation trigger for preventing information from falling in the hands of the enemy.
Then buy enough claymores to make sure there will not be a second encounter with enemy forces.
Not as part of core GrapheneOS, but an app called “Private Lock” can detect sudden force via accelerometer and disable the fingerprint based unlocking for next unlock.
But yeah, an erase passcode feature with opening a decoy profile would be a great feature to have.
E: grammar
A duress password to remove selected profiles would be amazing. So it still unlocks but quietly removes the profiles you are worried about.
Not even remove them, honestly. Just unlock the phone into a sanitized, honeypot account that has no access to the secured accounts contents!