Many have said that doing so is impossible because each fob is associated with a specific VIN. Maybe someone with write-permissions to a BMW server somewhere could change this association, but apparently BMW dealers cannot.
2019 BMW i3 Imperial Blue Metallic, Giga World, Tech + Driving Assist, Heat Pump, 428 Wheels
[SOLD!] 2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging