I'm not sure if this will work in Wildfire, but in previous versions it did. You need to add the following to your config.pro file.
rename_drawings_with_object both
The drawing does not have to be "in session". The model may be a part or assembly.
Perform a File, Save As on the model. The system will create a new drawing in the working directory with the same name as the new model. The new drawing is a copy of the original drawing and references the new model.
We used this all the time to get a new drawing with a new model. Hope this helps you out.
WRH