It seems like it would be a lot easier to just get an old Thinkpad with an easily removable 2.5" disk, such as an X201. It only takes a minute to install/remove

It seems like it would be a lot easier to just get an old Thinkpad with an easily removable 2.5" disk, such as an X201. It only takes a minute to install/remove the drive. They're super cheap and you don't need to carry a keyboard and find a TV to plug in to. You can get two drives, one is the real drive with full disk encryption, and then other is a decoy running Windows XP or something. When you check the laptop, just swap the drives and carry the real one in your carry-on.