Many many thanks to everyone who took the time to respond to my plea! There were many good ideas and suggestions which will help with my case.
I think my strategy may be to get another 2 copies of Framemaker for the 2 offices whose products I will be documenting, and get someone there trained up to do "emergency" edits. I really don't foresee there being many edits to be honest - I've been doing this job for many years and seldom have I experienced "documentation emergencies" :-) I really appreciate all your help. Laura