Thanks for the report Andy. In relation to smaller weights, have a look for Bright weights, I don't use them myself, but have a couple of friends who do and they offer some great tank mounted, small increment solutions.
For the handle issue, I have purchased one of the Portland Oceaneering backplates and they make carrying the unit much easier. It would be relatively easy to have a stainless steel handle manufactured and attached to existing backplates. For anyone intent on retaining the standard plate and harness perhaps you could lobby Mr Routley of Narced @ 90 fame....
Cheers,
Ben.