A secondary brain and computational theories of consciousness

There is an urban myth that the Stegosaurus had a secondary brain to control its rear legs and tail. Even though it's a myth, such a thing could certainly happen. I want to explore this thought experiment:

At the base of my spine, I grow a secondary brain, a large tail, and an accelerometer like the one in my inner ear. Moreover, sensory data from the tail and the accelerometer is routed only to the secondary brain, not to my primary brain, and my primary brain cannot serve signals to the tail. The secondary brain eavesdrops on nerve signals between my legs and my primary brain, and based on these signals and accelerometer data it positions the tail in ways that improve my balance when I walk and run. The functioning of this secondary brain is very complex and are such as to suffice for consciousenss--say, of tactile and kinesthetic data from the tail and orientation data from the accelerometer--if computational theories of consciousness are correct.

What would happen if this happened? Here is an intuition:

1. The thought experiment does not guarantee that I would be aware of data from the tail.

But:

2. If a computational theory of consciousness is correct, the thought experiment guarantees that something would be aware of data from the tail.

Suppose, then, a computational theory of consciousness is correct. Then it would be possible for the thought experiment to happen and for me to be unaware of data from the tail by (1). By (2), in this scenario, something other than me would be aware of data from the tail. What would this something other than me be? It seems that the best hypothesis is that it would be that it would be the secondary brain. But by parity, then, the subject of the consciousness of everything else should be the primary brain. But I am and would continue to be the subject of the consciousness of everything else and there is only one subject there. So I am a brain.

Thus, the thought experiment gives me a roundabout argument that:

3. If a computational theory of consciousness is correct, I am a brain.

Of course (3) is fairly plausible apart from the thought experiment, but it's always nice to have another argument.

So what? Well:

4. My hands are a part of me.
5. My hands are not a part of any brain
6. So, I am not a brain.
7. So, computational theories of consciousness are false.

The thought experiment is still interesting even if computational theories of consciousness are false. If we had such secondary brains would we, or anything else, feel what's going on in the tail? I think it metaphysically go either way, depending on non-physical details of the setup.