Lenz Law and Magnetic fields in an Inductor
Hoping somebody can set me straight on the magnetic fields involved in an inductor when the current is changing.

As we want to study the inductor under changing current conditions, we'll drive it with a current source.

This is how I see it:
The source current has a magnetic field. This changing flux produces an EMF which in turn produces a current ...

No, the EMF produced by the changing flux produces a voltage at the inductor's terminals. This voltage results in power flowing into the inductor as a result of the current flow. It's this demand for power that does the Lenz 'opposition' of the change in current. In the case of driving from a current source, this does not result in any change in current in the inductor.
If on the other hand, we had an inductor that we could move a magnet in and out of, then moving the magnet would change the flux and generate a terminal voltage. If there was a load, or a short circuit across the terminals, this would allow a current to flow, which would oppose the movement of the magnet, drawing power from the magnet motion and delivering power to the electrical load on the inductor.