I don't understand why anyone would use passwordless disk encryption. It just seems inherently vulnerable, especially with the threat model of physical compromise.
Entering a password on boot isn't even that much work
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Entering a password on boot isn't even that much work
You want to install and operate a device at a remote site with restricted (or no) VPN access and where you don't trust the local staff?
There is precisely zero chance that the relevant IT security goons would allow any kind of remote KVM/LTE connection.