Buying a supporter pack give me a second key?

Friend is interested in playing, since he is watching me. I wouldn't mind buying a supporter pack if it gets me another key that I can share with him.

Has anyone bought a supporter pack after already registering the free key they got to see if they get another key?

Yes, it will.

Just did this today for a friend of mine. It will show up under 'my-account/early-access' and can be redeemed under 'Shop>Redeem Key' on the website.

any free key