Looks like the private market is interested in a Vomit Comet kind of flight!
The thing is you need to pass exams to check the health, also tests about how one behaves in an environment with much less oxygen. I have a friend who wanted to do this but exams showed he had a problem with his eyes and had to be operated. He's fine, must be careful but didn't fly the OG Airbus.
I've got several friends, all here who did it (as part of their job animating the Eurospace Center). I don't work at the ESC but sometimes they ask for my help in translating texts into dutch and then they invite me at their place like here or here and we went together to Paris.
The bottomline is: O G is definitely fun but what about getting "unconfortable? Well, there are those damn medical tests anyway..

Raoul