Has anyone mentioned burning the transaction files to CD-R or CD-RW to transfer them between the online and offline computer?  Given that you control exactly what files will be burnt to the disc and that it's finalized/locked immediately afterward, isn't that one way to achieve certainty that you aren't accidentally transfering malicious files between the two machines?

I know it's not an ideal solution, but it's a solution nevertheless and seems pretty simple for the overly-protective user.

Thoughts?