10Gs for one minute shouldn't kill anyone in decent cardiovascular health - the result here would likely be little different than passing out under water from lack of oxygen and being pulled out after one minute - through three minutes or so would likely cause some brain damage. I've personally, ah, enjoyed 9Gs without a g-suit for a full minute - though I did have a great set of g-measles afterwards. The g-suit isn't magic - it gives your muscles something to push against, but you still have to strain. I wouldn't think that having oxygen supplied would make much difference - the GLOC occurs because the blood carrying the oxygen can't get into the brain, at least not without the forced increase in blood pressure that the anti-g technique causes - and as I recall your haemoglobin is nearly saturated with oxygen at normal atmospheric pressure anyway - having more wouldn't do much.
When experiencing frequent high-g events I found that my upper body would be sore, such as from working out too hard. The aerospace surgeons taught that the legs were the primary place to strain, which makes some sense as there's probably a good bit of blood there - but it's a long way back to the brain too - so creating a physiological condition in the lower extremities that gave the blood less volume to pool in, i..e. an anti-g strain, made sense. Having a suit to squeeze the upper torso also makes it hard to breathe, but I think there was a later test design that provided some upper torso push - guys who did best at heavy-g were usually strong-torso types. You learned early not to strain too much with the large gluteals, or to do it with the outer portion mostly - or you'd be soaking in the tub that night.
Actually, this ride sounds like a great ... thrill ...
