But alternatively, I have found one (count 'em, one) product which is great, in the way I think it should be done. (It should support the hand firmly, but comfortably, and have the thumb free to advance pages on the screen.)
It is the "TFY Padded Hand-Strap plus Velcro Adhesive Patch".
Home page. -- eBay page.
- They also have straps integrated with a light rubber case if you prefer.
- Note: for transport, it folds flat against the tablet.
- The use for a stand is OK... unless you want to tap too much, because it's not very stable, at least in the portrait orientation. But you can still use the kind of stand which is just a slit, without a back plate. Many of them are great.