If you want to view the .subcircuit values in the waveform viewer, you can (even though you cannot seem to use them in the circuit as you wanted) go to Tools-->Control Panel-->Save Defaults and click to add the subcircuit voltages and currents. You can then plot them in the waveform viewer (one BIG caveat is that your .raw file will become quite large...). I had hoped this would allow you to use the values, but it didn't seem to help. The 0 voltage sources works fine, but you will see some VERY small differences between the 0V source voltage and that produced by the Ix(M1:D) in the plotter. It's easiest to see them by plotting the difference (in this case, less than a milliamp) between the two values.
BB