There's a few of these approaches around the place. They are usually due to terrain with limited circling area or a very restrictive missed approach procedure. Don't know about Ingham specifically, but given a 10nm MSA of 4200' and an airfield elevation of 42' I would say this airfield would be the same.
If you want to fly there in an aircraft that's capable of meeting the missed approach criteria/staying within the circling area, then CASA shouldn't give you a hard time.. tried calling them?