why not just tie a boat anchor or other heavy object unto a rope, grab on and go? Can't get much simpler than that, and it gets you down there quik.
I've been thinking that there must be some co2 cartidge device for filling inner tubes .... If I find one I'm going to consider if that would work for the lift ballast, shouldn't be to tough to come up with some type of pressure relief valve so wouldn't blow up at the surface. Originally, I thought it would be a good way to take an inner tube along and fill it at the site without having to pump it up each time or have to carry it fully inflated.
Fred
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