Not to mention by the time you burned it it would be well out of date (security patches). If you're going to go that route you'd be better off buying a USB stick with a write-lock (Kanguru sells some).
As regular files (e.g. `cp ~/.gnupg/secring.gpg /media/kanguru/`) or can you somehow import them such as with a smart card?
I carry multiple devices at the moment but it would be nice to consolidate.