So I was wondering if it would be possible to connect my Sprint 8800, that doesn't have a data or phone service plan on it, to my 8320 via bluetooth and use the 8800's GPS abilities as a puck for the 8320?
No, the BBs need to use the built-in GPS; they can't be 'tethered' to a second phone to use services like that. depending on how long you need the service though you could always just swap the 8800 onto your account for a little while and then take it off again when you're done with the gps.