There are a couple of options, I wouldn't fit a vent that lets air in without having one to let it out and also they can be a dust pest.
Replacing a side glass with a polycarbonate clear or slightly tinted panel is a good option, if you go around the wreckers with a variety of utes you should be able to find one with the rear windscreen sliding section and flog that to go into the poly section. Keep the glass for a spare...
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