In order that this post should not be overlong, I will not argue at length here for the proposition that functionalism implies dualism...

This seems like such a necessary component of your argument that I think it was a bad place to skimp on the explanation. The outline you gave did little to convince me, I'm afraid. I could be wrong, but my perception is that I won't be alone here in that position. Split the post in two if it makes it too long...