Would it be possible to also add "end session" button to a default GrapheneOS profile to skip the system restart and just have keys wiped when in need?
grapheneos.org/faq#encryption
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No, since as explained there:
> This can't be done for the owner profile without rebooting due to it encrypting the sensitive system-wide operating system data.
Other user profiles can't be logged in if the owner profile isn't logged in. Rebooting is how you log out of it.