I've done that, and [so far] none of the refutations of #2 have been defended. If it cannot be refuted then what's next on the list?
Specifically for this case, that the mind is nothing but a product of matter.
So you can just throw out any unsupported nonsense and state that it's a valid refutation? That, again, is not how philosophy works.
Ok, let's assume for a second you are right, and the brain/body is actually a proxy for...whatever. let's call it X.
So X is sending a signal to the brain by undetectable means and methods, but the brain is destroyed, what can be left?
Everything 'you' know of yourself is through senses you will no longer have, that have formed memories that are stored in your brain, thoughts and contexts that have been molded by the experience of your physical body. So, no memory, no way to acquire new ones.
Just a DSL signal without a computer. Why is that even appealing?
Unless of course you are going to argue that this spiritual operator has his own brain and his own senses, but then who is operating that? Annnnnd we have infinite regress.