Actually, can it be a balloon jump? I only ask because a balloon (especially a hybrid helium/hot air type) could have the required endurance at altitude for you to off-gas the slow compartments to such an extent that it *would* affect your deco planning (especially considering the HALO jump's short descent-from-altitude time).
By the way, you *were* planning to dive a CCR, eh? Open-circuit scuba is just too bulky to get good bottom time on a rig light enough for a decent sport canopy.
There was this guy (YouTube - Joseph Kittinger - Highest Skydive) who jumped from a balloon at 103,000ft in New Mexico ...
