Scheduling the phone to automatically switch off at certain times (for example, every three hours) can be helpful if a Cellebrite or Greykey machine isn't available right after the smartphone is seized.
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This is a GrapheneOS feature by default, 18 hours but configurable to 30 minutes of inactivity. iOS implemented it too but it's done in 3 days of no unlock. The Shortcuts app could be useful for this as you can assign device restarts to a trigger. A more primitive shortcut could be to assign a reboot when the clock hits a certain hour such as when you're asleep.
Stronger USB port security features would help, I don't see why Apple couldn't copy what GrapheneOS does with disabling Pixels' USB-C port at a hardware level when they create both the phone and OS.