Hello Justin, I just did a little test with a small five track project.
First I froze the five synths.
Then I selected each audio result click file export Audio > Source category Tracks.
Selected a destination directory
Entered a file name and click export
This gave me the individual source tracks.
I could not test buses as this project did not use individual buses but there is also an option for bus output.
If the name had been the project's name SONAR appended the source tracks name to each of the exported tracks.
Which makes me think you could probably do it in two passes i.e. By track and then by Bus.
Hope that might help.