Most people taking pictures u/w want either a good picture, or are happy with a crappy picture. Both solutions exist, but not in the same package.
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Just as a thought exercise, I suppose I'd define what I'm looking for as
- an attachable external strobe,
- preferably supporting TTL,
- on a foldable arrangement so it could be used folded or unfolded,
- and the folded arrangement fits a drysuit pocket.
(I'm either looking for something the market doesn't desire; wouldn't be the first time -- or there's an unmet need here and quite a few smart people missing it.)