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What if a conscious person 100% agrees to donating him/herself as a subject for such a test (as a Reciever)? What if the bodies come from brain-dead patients who have fully admitted to donating their bodies (As a donor)?

I see no problem here if all involved persons accept to the procedure. And yes there will always be shady circumstances, but we also have that today with life-insurances, faked deaths, black market organ trade etc.

Why not just ask people? Why do we always have to talk 100 years about it being ethically OK, when there are people that WANT to be volunteers.