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Just have some more open windows! A 'return vent' is for a reverse cycle refrigerative system - which is essentially a closed loop. This is evapourative. You don't need any 'return air vents'. Diverting it into the roof cavity won't really work - out one hole in the ceiling and up another?? Even...

Read the link. It's an evapourative system. Not refrigerative. It's all about air flow - evap sucks air in from outside, evapourates some water which sucks the heat out of the air, then pushes it via ducting into the room. It then needs to get out - if the door is shut you need a window open...