I am now thinking of just creating a local user account with that mapped network drive as a log in item. So they can log into that local user account just for testing. Of course that may go into the image for next year, not quite feasible right this second.
I want to be able to package all of this via composer in one nice little app. There has to be a way to tell the test taker executable to launch the apple script instead of the application itself, then have the script launch the application after the drive is mapped.