What's the motivation behind keeping Bluetooth off? If you're just trying to avoid Bluetooth, I would just turn on Bluetooth, it works better than the Wifi sync and at the end of the day it's doing exactly the same thing, just with your phone as a bridge.
Another option for syncing is the desktop app, or just manually copying the fit files to somewhere. I sometimes copy the fit files and convert them to gpx to upload GPS traces places. Also I can view the GPX files in e.g. gpxsee which shows them on a map.