--snip--
Thank you. I presume that even if there was a virus or something on the Chromebook from the one and only time it was used, it wouldn't be able to steal my private keys if I go offline to create them and am never online again on that device?
It depends. It'll only stop virus which works by sending private key or other data to certain server using internet. You're still vulnerable to clipboard virus, which replace Bitcoin address when you perform copy and paste.