The training bond of +20K BHD was offered to all those A330's DEFO three years ago.
If you are already a GF's A320 driver and is transfered to A330/A340 you are requested to sign a three years, +12K BHD training bond.
Maybe the 5K BHD bond was an alternative case for Boeing drivers being transfered to Airbus, I am realy not sure about this.