Thanks, @coolcat!
I actually have Vascularity for G8. It helps, but it's not quite what I'm looking for.
It's hard to describe, but basically the knuckles of the carpals protrude a little more, the fingers kind of flatten on the inside and bulge a little on the outside, and the palm flattens and bulges at the heel of the hand.
And with that said, I think I'll see if I can't create that morph. Another possibility for the Custom Content category!