> Copy the login screen of original laptop on a brand new laptop, and have it log the password when the victim types it to you over wifi.
This is why you need mutual authentication. The easiest is with 2 passwords. You enter a password, this authenticates you to the system. Now system presents you some secret. It may be a passphrase, something not obvious like a password prompt with a typo, or a splash screen with some pixels a bit off that are visible at the right angle. Something that a casual shoulder-surfing won't gather. Only when the system is authenticated to you then you enter the 2nd password o actually unlock the filesystem.
As for "identical replacement" of a system - good luck. A bit of glitter and nail polish on screws and it will cost a fortune to do so. If you have those capabilities you probably have the capabilities to "nicely ask me for the password".
We used glitter glue on ports for certain traveling individuals. Took pictures of the hardened glue. Very hard for a maid to replicate, be it evil or really good.
If someone is considering an "evil maid" style attack, the objective is to compromise your security without you knowing (so that you will continue using the device believing it is still secure). "Asking nicely" isn't going to accomplish that.
This is why you need mutual authentication. The easiest is with 2 passwords. You enter a password, this authenticates you to the system. Now system presents you some secret. It may be a passphrase, something not obvious like a password prompt with a typo, or a splash screen with some pixels a bit off that are visible at the right angle. Something that a casual shoulder-surfing won't gather. Only when the system is authenticated to you then you enter the 2nd password o actually unlock the filesystem.
As for "identical replacement" of a system - good luck. A bit of glitter and nail polish on screws and it will cost a fortune to do so. If you have those capabilities you probably have the capabilities to "nicely ask me for the password".