I would go with the signature being your own with "for" before Bossie's typed name and title.  This is the appropriate way to sign for someone who is not availalbe to sign in person.  And since this is not something that needs to be over his personal signature, then I think it would be an acceptable option.  The stamp and/or electronic signature are things to look into for future problems such as this one, but neither are easy enough to do on short notice for this project.

CountriGal
Peer Moderator