This is the right attitude, my friend, for real.
I'm a teacher and have guided students down this path before. Tech rights are important, don't let anyone tell you otherwise. Surveillance is not security.
Buying that cheapo Linux lappy and running it on the down-low sounds like the best bet. Don't draw attention to it and you'll be fine.
The ethics of what you use it for is up to you: choose wisely. But simply wanting privacy is not a crime.