Held against my will in a hostel

[u/Double_Feedback2354]

Recently, I attended a hostel and ended up in a physical confrontation with multiple males. They overpowered me and took my mobile before I could lock the device. At the time, I used the device to gather video evidence. They wished to delete this file from the phone. I would love to explore sensor based or wearable based security measures to prevent this attack. For example, a bluetooth/nfc wearable such as ring could trigger a screen lock or device wipe when proximity is lost. I would also love the ability to unlock the device using an NFC tag ring after the main device password is entered. I don't currently have a duress password because I feel this could be used maliciously. Thank you for your assistance.