You've got to actually get the hardware to a lab.

And then put it through some type of process without losing state: the question is very much, how? There aren't a lot of options here.

More over you're doing the classic thing of basically worrying about the super-soohosticated scifi attack: but the government doesn't have better technology then universities can produce, they just have good coordination: and a much better use of that is just to socially engineer the password out of the target.