I can now safely say the process for adding keys to the bike is very straight forward. My only difficulty was due to the bike alarm (Averto) daisy chaining to the Pulse generator with different wire colours. Once I was confident that the white and yellow cabled red female plug was correct it went as planned. I followed provided instructions and referred to https://www.youtube.com/watch?v=db0ee6u7CjQ to clarify.

In case anyone is interested, here is the process:

Ensure you have your remaining key ready as well as the additional keys cut to match and tested in the ignition. The new keys will have to have ID46 RFID chips or they could be in an adjacent fob. You also need a cable with the same male connector as the pulse generator ECU connector on one end and red and black crocodile clips at the other.
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Unbolt the petrol tank with 8mm and 10mm sockets and raise it up to provide access underneath.
Locate the red plug with yellow and white wires and replace the male connection with the config cable.
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Now connect the crocodile clips to the battery.
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It should now look like this:
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With your original key turn the ignition to ON and ensure the HISS light stays lit. This indicates Diagnostic Mode.
Leaving it ON, disconnect the red crocodile clip for a few seconds, reconnect and ensure the HISS light flashes 4 times. This indicates Registration Mode.
At this point, the only key registered to the ECU is the one in the ignition.
To add more keys - turn ignition to OFF, remove key and move the key and its RFID away from the bike, insert new key and turn ignition to ON. After HISS flashes four times you can remove the key and repeat with additional keys.
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Now turn the ignition to OFF, remove the cabling and plug the pulse generator cable back in.

Attempt to start the motorcycle with the new keys.