Hi Sandra,
yes both are possible. I soon intended to share one demo I did in a previous class regarding an adrenal issue. Just created a video lecture on the adrenals, as they have both brain stem and medulla parts, so I'd like you to watch that first, and then the demo.
And of course I (or another trainer) can do assessments in class, as long as the volunteer "client" feels safe enough in the situation - that's why we did it in breakout rooms before. We can do this in one of the next classes on an old brain or medulla issue, and more when we went into details of the cerebral cortex.