This is too much. Uncrossable lines must be drawn immediately. Humanity cannot afford to "wing it" when it comes to ethics and morality at this scale. There needs to be clear lines where crossing means the highest criminal consequence to the researcher. And people funding it. And it needs to be a global effort. Everything needs a balance.
Why is this an uncrossable line, though? Clearly this research is meant to be a first/early step towards preserving brains in the event of traumatic bodily injury. Is that not a worthwhile goal? Is it outweighed by some possible nefarious abuse of this technique? There are obviously major issues to work out still, but I don't see how else this research can advance but with animal experiments.
I’d probably take the chance if faced with early death otherwise.