Why buy a copy if you don't care about being legal? By doing all of the things you suggest you may as well pirate, it'll be just as legal.
Burnsy
I would struggle to activate it. It is not worth pirating OSes, it's worth the money to pay for an OS.
If however i decide to change components in my PC, i will do so and i will be happy knowing i paid for my OS, i won't submit to what is a farsical restriction.