If airsickness is the only problem (and it may or may not be--for some it's a symptom of fear, and that is harder to both diagnose and solve), then I'd suggest the ReliefBand from Aeromedix, Sporty's, and Aircraft Spruce. It sends a small jolt of electricity through the medial nerve, which for reasons which are beyond my understanding, stop most nausea. It was originally developed for pregnant mommies suffering from morning sickness and for cancer patients reacting to chemo-therapy.
My SO won't fly any more, because of fear which I can't seem to get her beyond. But initially the issues seemed to be mostly nausea. We tried the Davis pressure wrist bands, which didn't do anything noticeable. So I decided to try the ReliefBand after an exchange of emails with Dr. Brent Blue, who owns Aeromedix. That totally solved the nausea problem, but not the fear problem.
The other benefit from our perspective, though, is that she likes boating--but that made her sick, too. With the ReliefBand, however, she's fine--no nausea whatsoever. The first time we rented a yacht in the Northwest, one day we found ourselves in some pretty rough water in the San Juans, and although it didn't bother me, I was concerned when I noticed that she turned up the ReliefBand (it has several function levels). I asked her how she was doing, and instead of the wan "I'm OK" I would expect when she's really not OK, she said, "Great! This is fun!"
On the issue whether a turbo'd airplane can get above the rough stuff, don't count on it. When I see echo tops reported via various weather services at over 40,000', I know it can't. Storms anywhere which are building can quickly (and I mean REALLY quickly) build to well past any height you can fly any light airplane, anywhere in the country. Right this minute:
There is a storm over Hutchinson, KS, with echo tops at 43,000'.
There are storms along the Gulf near Corpus Christi, Galveston, etc. with echo tops over 40,000'.
There's a storm near Haleville, AL with echo tops over 34,000'.
And echo tops aren't the actual tops, which are a lot higher.
I envy those who can get their spouses and SOs to fly with them--we'd go a lot of places by air if mine would. But at least she doesn't object to my flying!
Cary