I'm suggesting duress shouldn't be only pin/password, (1) phone can be snatched while it's being in use which leaves the phone data in danger.. (2) Also sometimes in emergency situation you will not be able to enter your the duress pin code/phrase, (3)iĆThere can be a mid emergency that you don't need to wipe your phone.
The solutions I'm suggesting
1) There's an app called lockdown on F-DRIOD , if there's detection of shaking or too much movement, the phone will go on lockdown mode, I suggest grapheneos should try to implement a features like that to avoid loses of data when phone is stolen or a situation where by the government can see any data when the phone is being forcefully or unexpectedly taken from you.
2.) The duress shouldn't be only password, I suggest they should allow duress to be activated on using a designed fingerprint for duress and also duress should be activate by clicking on fake airplane signs as it's what the police/thieves click on when they take your phone from you.
3.) In mid emergency situation, I suggest there should be a locked secondary user profile that can activated by using a designated finger on the fingerprint, the secondary won't show any signs there other user profile even in the settings and also the phone can't go back to the real user profile from the secondary user profile unless the designated finger on the fingerprints