Assuming this procedure worked generally, is it more ethical to donate the whole body to one person, or to parcel it up and donate the organs individually? If the latter, is there an ethical application for this procedure?

If the successful procedure is ethical, I'm inclined to err on the side of assuming the research is ethical. If it's not, we get into the much more complicated problem of a shortage of donated organs, despite what appears to be an available effective and ethical solution (making organ donation opt-out instead of opt-in).

So, in a sane world, I'd be inclined to conclude it was ethical because there wouldn't be an organ shortage. In an insane world, I'm somewhat leery of ethical conclusions that assume no other ethically mandated changes are allowable.