There is no need. The flex flight credit allows rebooking to a red-e-deal.How about purchasing a Red e-deal, for example MEL-SYD for $160 (there is maybe a cheaper routes to start with, I didn't search), and then later when needed, paying the $99 fee to make the required change to the desired DSC itinerary. Would that work? Would that make it possible to fly a DSC at Red-e-deal (or higher) fare, instead of being constraint to a flex fare from the Mt Isa -> Cloncurry?