I do find some kind of dualism to be the best medium between the intuitive and empirical, regardless of the bulk of philosophers' opinions.
If dualism is true in its more robust causative form: that is to say, the mind can act causatively on the brain, and doesn't just supervene on certain neural states, there's a promising avenue of verification. Simply find effects within the brain with no physical cause, which would presumably precede actions we take to be voluntary. For instance, a neuron could fire seemingly of its own accord. Or, if quantum mind theories are correct (as I dreamily fantasize), wave functions collapsing or whatever it is those things do.