As of v1.20, the D500 firmware allows WiFi to be enabled directly from the body, no need for snapbridge.
And AirNEF is working great, averaging 1.7MB/s at close range.
You know, if AirNEF had one more feature it might be perfect: under “Set Criteria…”, have an option to download only locked files. This would allow field-culling (pressing the lock button on keepers).