Altocumulus
Nimbostratus
I don't believe that you can relocate the file off of the local file system. The only options I am aware of are a Data Group within the local configuration file or an external class which is on the local file system (/var/class if I am not mistake).
I would suggest an iControl solution, but you would still be stuck in an access issue since the access account would require elevated permissions (there are ways around this but they each have their own unique challenges to implement).
If I am incorrect or you find a way to accomplish what you are needing please post the solution here. I would love to read it.