ATC guy here utterly unoffended. Air Traffic Control Service should be there to aid the safe, orderly and expeditious flow of traffic. Expeditious can sometime be tricky one: offer something that gets pilot from A to B more quickly and usually everyone is happy, but sometimes as above you just confuse matters or encourage a pilot out of their comfort zone. I would say the moral of this story is if you are being offered/cleared to do something you are not comfortable with then ask for a different solution. For what it's worth, my understanding of the original scenario is that although a RH circuit was in use, but the controller offered a more expeditious re-join downwind left-hand in to the circuit with the expectation that any missed approach or further circuits would be flown as the standard (for this runway) RH. In Uncle Rod's days at Woodvale the circuit would often have had civilians in a large, square LH circuit and UAS/AEF in a military oval RH circuit.