As a user of YWOL on an almost daily basis, attempting to land a 747-400 there would raise several significant issues.
Errrm .... you do realise they took a 747-200 into Longreach, right ? Min fuel, stopped it on the runway and towed it to final parking position etc etc. Pretty sure if they can get EBQ into YLRE they can get OJA into YWOL