Have you thought about fitting a car sunroof? You could use velcro to fit the mossie net.
I have seen some in breakers yards that were only half size as they had one each side of the car, (think it was a Volvo) I fitted a normal sunroof to my Defender, and there is something really satisfying about cutting a whopping great hole in your roof  As long as you can seal round them nicely, they would do exactly what you want. There is usually enough room under a roofrack for them to be opened as usual.
Gaz
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