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Yep, you can run an aeroscreen without wearing a helmet, but that's one hell of a risk to take and I don't know anyone who would. Helmets are fine of course, but SWMBO has to be a pretty good sport to get out the other end of a trip with hair like a troll. Half doors with the wind deflectors are well spoken of as an alternative. Finally, and this may sound obvious, is the passenger seat all the way back against the rear bulkhead? If it's on runners, bringing it forward somewhat might change the dynamics just enough to work.

As stated, it's an open topped car and you're always going to get buffeting. The windscreen cutting through the air creates a low pressure zone in the cab, and as nature abhors a vacuum, the air rushes in from behind to fill the low pressure area, which is why you get buffeted from behind. If you really want to get buffeted, take the side wind deflectors off - you'll find you can't breathe after 60 mph. This is commonly known as "Westfield nose". A rear mesh and perspex roll hoop wind deflector will help slightly, but it won't eliminate it. Full side doors work pretty well, but you do lose some fun IMHO as it can feel a bit claustrophobic. Side wind deflectors, a fashionable head scarf for the missus, and good sunglasses / goggles is how I tend to run, along with keeping a good hairbrush in the boot box. You need to enjoy the experience rather than fight it too much.